If you’re one of 33% of Americans who’ve turned to fertility treatments or know someone that has, such as IVF, to conceive, your doctor can easily determine your expected due date by using your expected IVF transfer date (i.e. or-for our IVF mamas-to-be-by using the date of your IVF transfer. Methods Your Doctor Can Use to Calculate Your Due DateĪside from the methods utilized in this pregnancy calculator, you can also learn your due date by asking your doctor to perform an ultrasound scan. (You add 266 days because the average pregnancy is 280 days, minus the 14 days of your cycle). Ovulation typically occurs on day 14 of a 28-day menstrual cycle, so adding 266 days to your conception date will give you your baby’s due date. The date of conception is essentially the date you ovulated, which can be used to calculate your estimated due date. If fertilization doesn’t occur within this time period, the egg dissolves. This is the part of your menstrual cycle when a mature egg leaves your ovary in the hopes of becoming fertilized in the 12 to 24 hours after release. If you were tracking your cycle you may know your ovulation date and use this date of conception to estimate your due date. So although you won’t be seeing your period for a while, Aunt Flo can actually help you discover your estimated pregnancy due date. You can also count back 3 calendar months from the first day of your last period, then add 1 year and 7 days to that date.īaby center has copy about why it’s 40 weeks + ovulation that could be good to add something similar Find the date that marks the first day of your last period.On average, pregnancies last around 40 weeks, or 280 days. Using the first day of your last menstrual period is the most common method for calculating your due date. Take a look below at how each of these methods works. Our due date calculator gives you the option of two methods to determine when your baby will arrive: the date of your last menstrual period or your conception date, also known as ovulation date.
She is the owner of The Genesis Resort for Birth and an Assistant Professor of Nursing at James Madison University. Heather has 15 years of women’s health and obstetrics experience. The due date is calculated based on the size and development of the baby.Dr.
It is known as the dating scan and it will give you a more accurate idea of when the baby is due, usually it’s not as far advanced as the date of your last period suggests. You usually have your first scan at 12 weeks, however it can happen anytime between week 8 and 14. Your due date might change when you have your first scan. Will the due date change when I have a scan? Knowing this can help you to get planning - from preparing for labour and birth plan to baby showers and hospital bags. It is likely though that your baby will be born in the few weeks either side of your due date. In fact, only 4% of babies are born on their due date. Unless you have been having fertility treatment it is very difficult to know the exact date of conception - and even if you did know pregnancies can last anywhere between 37-42 weeks. Unfortunately, babies work on their own timescale so use the date as an indicator rather than a fixed date. It is important to note that it is an estimate. Most pregnancies last 40 weeks, our calculator uses this information to work out your due date. Most women ovulate about two weeks after the first day of their period and conceive shortly afterwards. That’s why your due date is calculated based on the first day of your last period. Unless you have been tracking your ovulation, it is very difficult to know for sure exactly when you ovulated and conceived. In fact, on the first day of your missed period you are already four weeks pregnant. Pregnancy is not calculated from the first day of your missed period, as many might think.
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