Congratulations your expecting! You know when you’re due but you might be desperate to know when your baby was conceived. BellyBelly’s reverse due date calculator can help you figure out exactly when you became pregnant. Using your baby’s due date, BellyBelly’s conception due date calculator will tell you when your baby was conceived.
What is a reverse due date calculator?
A reverse due date calculator is used to calculate your conception date, so you can identify when you fell pregnant. Using your baby’s due date, the date of conception can be approximately calculated. No matter what your menstrual cycle length is, we can determine an estimated date for conception based on when your fertile window is likely to be.
According to a 2023 Cochrane research review, the fertile window begins five days before and ends a few hours after ovulation. A reverse due date calculator doesn’t consider the date of your last period, but uses your estimated due date and works backward for a date of conception.
How does a reverse due date calculator work?
At your first trimester ultrasound date, the sonographer will give you an estimated due date. Your developing baby’s measurements gathered during the ultrasound are used to calculate where your little one is in their development and then give you a date for when you will reach 40 weeks. This is your estimated due date, although you are considered full term anytime from 37 to 42 weeks. Very few babies are born on their due date.
BellyBelly’s reverse due date calculator takes your estimated due date and works backward to determine when conception is likely to have occurred. Our due date reverse calculator will give you two results: conception date and intercourse date.
Your intercourse dates signify your fertile period, and you likely had successful TTC (Trying To Conceive) sex on one of those days. It can sometimes take a while before sperm meets the egg. Sperm can lie in wait for up to five days before ovulation, meaning you don’t need to have intercourse on the day of ovulation to get pregnant.
The egg can survive for up to a day, so having sexual intercourse the day after ovulation could still result in you falling pregnant.
How accurate is a reverse due date calculator?
Using a reverse due date calculator isn’t an exact science but it can give you a pretty good idea of when your pregnancy began. If you want to know when your baby was conceived, BellyBelly’s free reverse due date calculator will pinpoint it to your estimated fertile window.
It is most accurate when you put in your official estimated due date from your 12-week scan. If you use the reverse date calculator in early pregnancy, you’ll have to put in your estimated due date based on your last menstrual period. This will probably be less accurate, especially if you have irregular periods or atypical cycle lengths.
Although the reverse due date calculator isn’t 100% guaranteed and we can’t provide an exact day, we’re confident it will produce the most likely dates for conception.
Can a reverse due date calculate conception date?
Yes, that’s the whole point of a reverse due date pregnancy calculator. Now that you have a due date, you might be keen to work backwards to figure out when you became pregnant. Many women are desperate to know which time worked, especially if they’ve been trying for a while.
You might be keen to see whether it was the romantic date night paying off or the ‘quickie’ before work that resulted in pregnancy.
Click HERE to get the FREE weekly updates our fans are RAVING about.
What is a due date reverse calculator by ultrasound?
When people refer to a due date reverse calculator by ultrasound, they simply mean you’ve used the due date provided by your ultrasound technician to determine your conception date. Doing this provides greater accuracy because sonographers measure your baby at your first trimester scan to give a more accurate ultrasound date.
Before your 12-week scan, your healthcare provider calculated your baby’s gestational age using the first day of your last menstrual period, which can give a wildly inaccurate estimated due date.
Cycle length varies between women (and between months), so you won’t get an exact date you can trust until you’ve had your dating scan.
When did I get pregnant exactly, in weeks?
The calculator can help you determine the date of conception. Although you might think you got pregnant at the official start, conception occurs during week two. You are not actually pregnant during the first two weeks of pregnancy; during this time, your body is busy preparing for pregnancy.
Your healthcare provider will calculate your pregnancy from the first day of your last period because this is when your 40-week countdown begins, even though you won’t conceive until you’re two weeks pregnant (confusing, huh?). That’s why you’re already four weeks pregnant by the time you get a positive pregnancy test result.
To sidestep this confusion, put in your estimated date for 40 weeks in the reverse pregnancy due date calculator to find out the date of conception.
Can I use the reverse due date calculator to plan when to conceive my baby?
Some women might use the calculator before pregnancy to determine the best time to conceive. If you’re keen to have a baby at a particular time of year or would rather avoid certain months, you can certainly look to see which months to avoid when trying to conceive. It’s important to remember, though, that getting pregnant doesn’t always happen quickly.
It’s impossible to guess how long it will take you to fall pregnant. Even if you’ve become pregnant quickly before, it could take longer this time. Or vice versa. Pregnancy can’t be pre-planned like that; unfortunately, you might have to go with the flow as far as pregnancy is concerned.
What is a perinatology reverse due date calculator?
Perinatology is the branch of obstetrics that cares for women during high-risk pregnancies. Obstetricians who specialise in perinatology receive special training to care for both mother and baby during high-risk pregnancies and births. A perinatology reverse due date calculator is a reverse pregnancy due date calculator that determines the date of conception.
