If my baby is due in july when did i conceive

Reverse Due Date Calculator - Mama Natural

• Note that you can go back in time (for example, to your birthday) to see the date of conception.
• You can also go into the future to see when you’d need to conceive to have a baby around a certain date.

What is a Reverse Due Date Calculator?

A reverse due date calculator is the exact opposite of a due date calculator. A due date calculator works when you know the date of your last menstrual period (LMP) and it helps you predict baby’s due date from there. But a reverse due date calculator works when you know your due date, but you’re not exactly sure when you had sex or conceived the baby.

Why Use a Reverse Due Date Calculator?

• Maybe you had a dating ultrasound at your first prenatal appointment that provided your baby’s gestational age and due date.
• Maybe you want your baby to be born in September or later in the year, so you want to know when to conceive.
• Or maybe you’re feeling nostalgic and wondering when you or one of your children were conceived?

Whatever the case, you’ve come to the right place. Our reverse due date calculator can help you do the math in an instant.

• A reverse due date calculator uses your estimated due date (or the date of birth) to figure out the approximate date of conception.
• A reverse due date calculator will also tell you the window in which intercourse most likely led to conception.

What Is the Date of Conception?

The date of conception is date a baby is created, but not necessarily the date you had sex (more on that below). Conception occurs when sperm comes into contact with and fertilizes the egg that is released from a woman’s ovary during ovulation.

Can You Calculate the Exact Day of Conception?

Precisely when conception happens is a little bit more of a mystery. Pinpointing the exact date of ovulation is complex. Most women ovulate between days 11-21 of their monthly cycle, but as you can see, that’s a big window of time. What’s more, many women don’t closely track ovulation by monitoring cervical mucus and basal body temperature, and even those who do can be off by a day or more.  

To add to the confusion, conception can occur in a few hours after intercourse, or it can occur up to a week after intercourse! How is that possible? If the conditions are right, sperm can live inside a woman’s body for up to a week.

Why Is the Date of Conception Important?

Most due dates are calculated off of a woman’s last menstrual period (LMP). That’s how our due date calculator works. The problem is that this method of establishing an estimated due date isn’t always accurate, especially for women who don’t have a standard 28-day cycle. Still, it’s become the standard, since most women are more likely to know the exact date of their LMP than the exact date they ovulated.

The whole concept is a bit confusing though. According to this pregnancy dating method, your first—and sometimes even second—week of pregnancy occurs before you even did the deed! Huh?! 

Therefore, pinpointing conception—when sperm and egg actually meet to create new life—is a much more accurate representation of when your pregnancy began. And it can help you answer the question “How many weeks pregnant am I?”

If you’re currently pregnant, having a clear idea of when your pregnancy actually began is important at the end of your pregnancy when the conversation may turn to induction. There are risks for both mama and baby if induction occurs before the body is ready to go into labor, so if your healthcare provider thinks you’re further along than you really are, you could be encouraged to try induction sooner than necessary.

And that’s where the reverse due date calculator comes in.

How Do You Calculate Date of Conception?

Much like a due date calculator returns an estimated due date, a reverse due date calculator will return an estimated date of conception.  Although it may seem like it, a reverse due date calculator isn’t magic—it’s just some simple math.

For a regular 28-day cycle, pregnancy is estimated to be 280 days, or 40 weeks, from your last menstrual period, and 266 days, or 38 weeks, from the date of ovulation. Therefore, to calculate the most likely date of conception, you need to subtract 266 days from your estimated due date. 

What Is My Due Date Based on Date of Conception?

If you know with relative certainty when you conceived or have used our reverse due date calculator, use that option in our due date calculator or our advanced due date calculator to get a more accurate estimated due date.

How Many Weeks Pregnant Are You?

Pregnancy is exciting, and it’s fun to use tools like the reverse due date calculator to learn as much as you can about that tiny human growing inside of you. To help, we’ve created the free Mama Natural Pregnancy Week-by-Week series.

The first thing our due date calculator tells you is, of course, your estimated due date. But the second thing it tells you is how many weeks pregnant you are. If you scroll down the page, you’ll get all kinds of information about baby’s development, plus what to expect when it comes to your changing body.

To get this information delivered straight to you each week, sign up for the whole series through Facebook Messenger or email, or visit this page to skip ahead and see all 40 weeks right now.

Ready to Use Our Reverse Due Date Calculator?

Conception Date Calculator | When Did I Conceive?

Created by Dominika Śmiałek, MD, PhD candidate

Reviewed by Dominik Czernia, PhD and Jack Bowater

Based on research by

“Committee Opinion No 700: Methods for Estimating the Due Date.“ Obstetrics & Gynecology (May 2017)See 1 more source

Kessler J, Johnsen SL, Ebbing C, Karlsen HO, Rasmussen S, Kiserud T. “Estimated date of delivery based on second trimester fetal head circumference: A population-based validation of 21 451 deliveries. “ Acta Obstetricia et Gynecologica Scandinavica (October 2018)

Last updated: Dec 22, 2022

• Conception date - when did I conceive and how many weeks am I?
• Conception calculator based on due date
• Conception calculator based on LMP
• Practical example of the use of conception date calculator
• Can the pregnancy conception calculator be wrong?
• First signs of pregnancy
• FAQ

This conception calculator helps you to estimate the conception date of your child. Is your period late? Are pregnancy tests show clear results? Congratulations! Or perhaps you're not pregnant yet, but want to have a kid on an exact date? Don't hesitate - the pregnancy conception date calculator also works in reverse - it tells you when to conceive if you want a child born on a day of your choosing.

With our conception calendar calculator, not only do you get an answer to the question when did I conceive and how many weeks am I pregnant?, but you can also learn a bit about when does conception happen, and how long does conception take.

Conception date - when did I conceive and how many weeks am I?

Do you remember the moment you realized you were pregnant? After the initial excitement, you probably estimated your due date with a due date calculator. And after that, you might have gotten curious about the day you conceived. This conception calendar calculator will help you put all your doubts aside.

We know that having children changes your life completely. It affects your daily plans, holidays, and overall free time. Some say that it's easier for a kid to be the oldest in their class - they tend to be more mature and gain new knowledge easier. That's only one of the reasons you might want to have your child's birthday thought out well ahead. Although whether mother nature will allow you to keep such plans is another story, you can still use this pregnancy conception calculator to estimate when you should conceive to have a kid on a certain date.

Conception calculator based on due date

So, what day did I conceive? There are two ways to use our conception calendar calculator.

The first way is to provide the birth due date. When you visit the doctor, they will most likely perform an ultrasound. Although the doctor can see the baby from the 5-6th week of pregnancy, the best time to go for the first sonography is between weeks 8 and 12.

Based on the characteristics of the image and the results of your [blood test, compared with hCG levels calculator, the due date and week of pregnancy can be determined. Remember that those dates, as well as the conception calendar, are only an estimation and may change during the next visit.

Pregnancy typically lasts around 40 weeks (counted from the first day of your last period). That is 266 days from the conception date. If a baby is born before week 37, it's called premature birth. But don't worry if the due date changes or you go into labor on a different date - only 4% of babies are born on their due date, and 80% are born either two weeks before or after the date.

Let's go back to the question: what day did I conceive? In our conception calculator, we subtract 266 days from the estimated due date and get the most probable day of conception:

due date - 266 = conception date

Conception calculator based on LMP

The other method of using the pregnancy conception calculator is to provide the first day of your last menstruation (LMP) and the average length of your menstrual cycle. The majority of cycles last around 28 days. However, typical values range between 21 and 35 days.

In cycles of 28 days, ovulation happens around 14 days before the beginning of the next cycle. So, if a cycle lasts 28 days, ovulation occurs the 14th day after the first day of the cycle (the first day of bleeding). If it's shorter, you subtract the corresponding number, e.g., for a 22 days cycle - ovulation occurs on the 8th day. If it's longer, you add some days, e.g., for a 34-day cycle - ovulation is on the 20th day. For cycles longer than 35 days or shorter than 21 days, these calculations are not applicable, and you should consult by a doctor. If you're not sure how long your cycles are, leave the default number of 28 days.

When does conception happen? How long does conception take? The fertile window begins 3-5 days before the ovulation date and ends one day after it. It means to get pregnant, you should have intercourse within this time. Although sperm can survive up to 7 days inside a woman's body, conception does not happen until ovulation. Therefore, conception day is the day of ovulation (use our ovulation calculator to quickly check it) and might last for 24 hours after the egg is released. Therefore, the formula to estimate the conception date based on the LMP:

LMP + cycle length - 14 = conception date

Practical example of the use of conception date calculator

Let's take Anne. She is 11 weeks pregnant and still doesn't know her conception day. The first day of her last period (LMP) was 11 June 2018, and typically, her cycle lasts for 31 days (still in the range between 21-35). As mentioned before, we can assume that her ovulation began around 17 days after her LMP, on 28 June 2018.

11th June 2018 + 17 days = 28th June 2018

She conceived around her ovulation date (as a woman's egg can last up to 24 hours), on 28 June 2018. However, instead of all this counting, she used our pregnancy conception calculator.

Next up is Maggie. She just came back from the doctor, who told her that the due date is on 19 September 2019. Now, she has one question: 'what day did I conceive?'.

19th September 2019 - 266 days = 26th January 2019

You don't have to do the calculations by hand! Just put the numbers into our conception date calculator based on the due date. It can also work as a pregnancy week calculator, giving you an estimated week of pregnancy and the first day of your last period.

Can the pregnancy conception calculator be wrong?

Yes, of course. So, when does conception happen? There is no possibility being 100 % sure about it. You may be a little bit more certain if you track your cycle and have it perfectly regular. But even ultrasounds and blood tests aren't faultless. Remember, that your fertile window begins up to 5 days before ovulation and ends one day after it. So, although your conception date is, e.g., 11 July 2019, the intercourse that caused the pregnancy may have occurred as early as 6 July. However, with our conception calendar calculator, you can make an estimated guess!

Is your period late? Do you have some of the symptoms listed below?

• Tender, swollen breasts
• Morning nausea
• Food aversions or cravings
• Constipation
• Mood swings

You might be pregnant! Congratulations. Now it's time to take a pregnancy test and make an appointment with a doctor.

We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. If any health condition bothers you, consult a physician.

FAQ

How accurate are conception dates?

No conception date calculator is completely accurate, as they are estimating the date it occurred. The most accurate measure is to take an ultrasound and have a professional estimate the age of your baby for you. This service, however, will likely cost you though, so use best use an online calculator.

Does alcohol affect conception and implantation?

Moderate drinking does not impact fertility or the risk of miscarriage in regular pregnancy, a number of studies have found. However, if you are trying for a baby using IVF, both partners should not consume any alcohol. The woman should always stop drinking as soon as she finds out she is pregnant.

Where does conception occur?

Conception occurs in the fallopian tubes, more specifically the ampulla, where the oviduct curves around the ovary. The egg releases large amounts of progesterone here, which the sperm are attracted to. This is how the sperm know how to reach the egg.

When should I take a pregnancy test calculator based on conception?

You can estimate the day you conceived on as soon as you know you have missed your period. This is also the best day to take a pregnancy test. Use Omni Calculator to work out your conception date quickly and easily.

What is conception date?

Conception date is the day on which a baby was conceived, that is, the day on which the father’s sperm fertilised the mother’s egg.

How far along am I based on conception?

1. Calculate the number of full month differences between today’s date and your conception date.
2. Calculate the number of days in each of the months in step 1.
3. Work out the number of days from the conception date until the end of that month.
4. Find the number of days from the beginning of this month until today.
5. Add together the result of step 2, 3 and 4. This is how far along you are.

When is my conception date?

To find your conception date, you will have to perform some calculations to estimate it. Find out on what day your last period began, and add your average cycle length in days to that date. Finally, subtract 14 days and you will have an estimate of conception date.

Dominika Śmiałek, MD, PhD candidate

To calculate the conception date, please enter the due date or the first day of your last period (LMP).

Due date

First day of your last period (LMP)

My average cycle duration

I am in week

of my pregnancy

I conceived on

Check out 34 similar gynecology & pregnancy calculators 🤰

BBTBirth controlBishop score… 31 more

How do I know exactly what day I got pregnant?

August 21, 2020

Many women are very concerned about this issue, because the more accurately you can determine the date of conception, the easier it will be to predict the date of birth of the baby. But is it realistic to determine the exact date of conception and how to do it? Let's find out.

First of all, you should know that the date of conception always coincides with the date of ovulation, since the egg remains viable only for the first day after leaving the follicle. Another issue is that few women can accurately determine the day of ovulation - only ultrasound control will show this with absolute accuracy. nine0005

The second point worth knowing is that the date of sexual intercourse will not always be the date of conception. Why? Because spermatozoa remain viable in the uterus for 4-7 days, which means that pregnancy can occur even a week after sexual contact.

How then to determine the day of pregnancy? Here are some methods.

1. Early ultrasound.

   If ultrasound is done for up to 7 weeks, then the date of conception can be determined most accurately, with an error of 2-3 days. During this period, the embryo develops proportionally and its size is approximately the same in all women. At later dates, the size of the fetus can vary greatly, so it will be almost impossible to calculate the exact day of conception. nine0005

2. Last period.

   This method is quite accurate, but only if you have a stable, regular cycle. To determine the date of birth, you need to add 280 days to the day of the last menstruation. To simplify the calculation, you can use the following formula: subtract three months from the month of the last menstruation, and add 7 days to the day of the last menstruation.

3. First fetal movement.

   Not the most accurate method, but still helps to determine the approximate gestational age. Usually, women begin to feel the movement of the baby at 18-20 weeks. Thin and multiparous women can feel the movement of the fetus as early as 16 weeks. nine0005

So, as you can see, the most reliable ways to determine the exact date of pregnancy is the day of ovulation and ultrasound in the early stages. That is why it is important not to delay with an ultrasound and visit a doctor as soon as possible after a positive result of a rapid pregnancy test. The best way to do this in a comfortable atmosphere is to choose our medical center. Here are friendly and highly qualified specialists who will answer all your questions.

Share

To get the consultation

Current

November 24, 2022

What is a woman entitled to in a maternity hospital?

It just so happens that the rights of ordinary citizens are not taught in medical institutions, therefore, in order to achieve respect for these rights, you need to know about them in advance.

November 22, 2022

Postpartum recovery

Already in the first hours after childbirth, a restructuring begins in a woman's body, which helps to prepare for a new stage - lactation.

November 15, 2022

Cervical dysplasia

Dysplasia is a pathological change in the epithelial cells of the cervix. This process, developing from stage to stage, leads to malignant degeneration of cells.

Get advice

Enter your name and contact phone number. We will call you back and schedule you at a convenient time.

Pregnancy in questions and answers - Useful articles

What to expect? How to eat? How to deal with difficulties? How to do everything right? These and many questions will be answered by Irina Alexandrovna Soleeva, an obstetrician-gynecologist at the Sadko clinic.

- How is the due date calculated?

From the first day of the last menstrual period. To determine the due date, 280 days are added to the first day of the last menstruation, i.e. 10 obstetrics, or 9calendar months.

Usually, the calculation of the due date is simpler: from the date of the first day of the last menstruation, count back 3 calendar months and add 7 days. So, if the last menstruation began on October 2, then, counting back 3 months (September 2, August 2 and July 2) and adding 7 days, determine the expected date of birth - July 9; if the last menstruation began on May 20, then the expected due date is February 27, etc.

Expected due date can be calculated by ovulation: 14-16 days are counted back from the first day of the expected but not arrived menstruation and 273-274 days are added to the found date. nine0005

- And if you know the exact date of conception, how many days to add?

A large-scale study was conducted with a large number of pregnant women, according to various indicators, the gestational age and, accordingly, the date of birth were determined. It turned out that the woman most often remembers the date of the last menstruation. And from this fixed date, as the study showed, childbirth occurs at the 40th week ± a couple of weeks. Obstetrician-gynecologists are guided precisely by this system of calculations. nine0005

- Should I change my diet, if so, how?

4 meals a day are recommended in the first half of pregnancy, 5-6 meals a day in the second. It is better to eat often, but little by little. For healthy women, there are no forbidden foods (except alcoholic beverages), only more or less preferred ones.

So, the body absorbs easily digestible milk fats and vegetable oils better. The latter are not only a source of essential linoleic acid, but also vitamin E, which has a positive effect on the course of pregnancy. nine0005

To eliminate constipation, it is worth enriching the diet with sources of dietary fiber (fiber, pectins) - vegetables and fruits, buckwheat and oatmeal.

In the second half of pregnancy, sugar, confectionery and flour products, rice should be eaten in very small quantities. Do not get carried away with fried, spicy, salty foods, because. during this period, the liver and kidneys of a pregnant woman function with tension. It is better to prefer boiled and steamed dishes.

The main thing is to include a variety of foods in your diet: vegetables, fruits, juices - and you will provide yourself and your unborn child with everything necessary for normal development. nine0005

- I really want olives, but they are canned. Can?

It depends on the gestational age. After 20 weeks, I would not recommend eating too salty foods, including olives. And in general, any canned food is not the most suitable food for a pregnant woman. Although olives, in themselves, the product is very useful. Therefore, within reasonable limits, say, a jar can be eaten in two days.

- And the grapes?

Grapes are very well digestible. It's fructose. It is immediately absorbed and quickly raises blood sugar. But if you are overweight, it is either not recommended at all, or it is allowed in small quantities. It is allowed to eat a small brush, or you can treat yourself to something else.

For some reason, it is customary for us to believe that if you are pregnant, you have to eat for three or whatever you want. As a result, pregnant women buy grapes in boxes and eat them in kilograms. Such a diet does not lead to anything good: sugar appears in the urine, blood sugar rises, babies are born large. Moreover, a large load falls not only on the mother's pancreas, but also on the child's pancreas - the baby from birth will be predisposed to being overweight. nine0005

- Is it possible to reduce excess weight during pregnancy and cleanse your body with the help of special teas?

All cleansing teas are contraindicated during pregnancy. We have drugs that improve the functions of the liver and kidneys, which have a diuretic effect. We assign everything individually. There are no special cleansing procedures during pregnancy. However, we have fasting days - here is the best cleansing procedure for you.

- Which vitamins are best for pregnancy?

Now there is a huge selection of various vitamin complexes for pregnant women. Of course, they are all close to each other in composition. One or two components or the dosage of some vitamin differ. In order not to harm yourself and the baby, to achieve the maximum effect, each patient needs to select vitamins, based on the advice of her doctor, who controls the course of pregnancy.

- How long should I take them? nine0073