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You may find it easier to use our pregnancy due date calculator.
If your menstrual cycle has been too irregular and you aren’t sure of the date of your last period, an ultrasound will give you a more exact idea of your developing baby’s size and be able to calculate your due date.
This is how most health professionals will work out your due date.
Your pregnancy should last nine calendar months and seven days, or 40 weeks.
) and as the reality of that pink line starts to set in, you reach for your calendar to mark down the big D-day (due date). You know which day you started bleeding, but do you know with 100 percent accuracy the day you ovulated?
In fact, a full-term pregnancy is considered to be anywhere from 38 weeks to 42 weeks long (a baby born at 38 weeks isn't "early" anymore than one born at 42 weeks is "late"). It seems odd that the medical powers that be (and that determine these kinds of things) would start the time clock on pregnancy before sperm even meets egg (and before your ovary even releases the egg), but it actually makes perfect sense.
Although the estimated day of conception is the day you first become pregnant, most people don't count pregnancy from that date.
That's because there's no way to know for sure on which day you actually ovulated and conceived.
You've only been pregnant five minutes, and already you're confused. Take a seat, a deep breath, and get ready for pregnancy math 101 (and don't worry — you don't need to pull out your high school algebra notes…or worry if you didn't actually get around to taking any).However, due dates are just an estimation as to when the baby may arrive.Only about 5% of babies are actually born on their due date, but you need to have a general idea of when your baby should arrive to monitor its progress and development.And sperm can hang around to fertilize for three days after intercourse. But that's the way your practitioner (and everyone else) will most likely count the weeks.So even if you know the day and time your egg was released, you don't know for sure the date sperm and egg actually got it together.) Which explains why the first day of your pregnancy (at least when it comes to dating it) begins on the first day of your last menstrual period (LMP) — even though your baby is technically about two weeks younger than that (most women ovulate and conceive two weeks after their LMP) and will only have clocked in 38 gestational weeks by the time your pregnancy has reached the 40-week mark. Keep in mind that women with irregular cycles may have difficulty calculating their due dates (the LMP method is far from a perfect science), so if you fall in that camp talk to your doctor to get the best estimate of your due date.
Our calculator estimates your due date based on LMP, your average cycle length and your luteal phase length.