![]() (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. Unpredictable and teaching us patience and flexibility literally from minute one.Dr. No matter what method you use for calculating your due date, only about 4% of babies are born on their actual due dates, and designating a birth month is a more accurate (albeit more annoying) way to think about things.īabies. Your doctor should be able to tell you when your babe is expected to make their arrival, but even knowing the exact moment of conception doesn’t guarantee a darn thing. What If I’ve Had IVF or Know The Exact Moment of Conception? ![]() Studies suggest it is twice as accurate as Naegel’s Rule, but again, all due dates are a rough estimate of when the baby will be here, rather than a hard and fast rule. The Mittendorf-Williams technique predicts the average due date to be 288 days from your LMP, and uses 16 factors that may have an influence. Is There a More Accurate Way for Calculating the Due Date? But for those who have longer or shorter luteal phases, conception can happen several days in either direction of this window, moving the due date accordingly. This is your window of opportunity, and is the time frame where fertilization generally occurs. How a Due Date Calculator WorksĪssuming your cycle is 28 days, that means your luteal phase, the time after ovulation, where an egg travels down the fallopian tube chancing an encounter a sperm, typically happens around day 12-14 of your cycle. Just like any due date calculator, this one isn’t exactly perfect since it makes the assumption that your cycle is 28 days, but it’s a fairly good place to start. There are a few schools of thought about how to get the most accurate due date, but the most common method, Naegele’s Rule, is made by counting out 280 days from the start of your last menstrual period. In order to figure that out, you’ll need to A) go wash the pee off your hands, and B) think back to when your last menstrual period (or your LMP) was. Calculating the due date of your precious cargo is a natural first step after getting your positive test.
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