Sonogram dating and birthdate dating in a relationship difference

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You can calculate your due date by subtracting three months from the first day of your last menstrual period (LMP) and then add a week. A pregnancy is based on being 280 days long, which is 40 weeks (more like 10 months not 9! When we give you a due date we consider 37 to 42 weeks to be full-term, so even if your baby is born two weeks before your due date it is not considered premature.

The accuracy of using your LMP to date your pregnancy depends on having regular cycles and assumes you ovulated (released an egg) on day 14 of your cycle and conceived right away - ­ none of which may be true.

The calculator also estimates a possible range of days during which sexual intercourse might have led to conception based on sperm being viable for 3-5 days within a woman's body. Many women often ask this question when trying to figure out the exact day their pregnancy began.

Often, gestational age, or the age of the baby, is calculated from the first day of the mother's last menstrual period.

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However, if you did not get a first trimester ultrasound for dating and an ultrasound done to look at the baby's anatomy (usually at 18-20 weeks of pregnancy) differs from your LMP date by 10 to 14 days, we would change your date to the ultrasound estimate.

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This calculator helps to estimate the date range of real conception and a possible range of days during which sexual intercourse might have led to conception.

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