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https://www.babycenter.com/pregnancy-due-date-calculator
Jan 23, 2020 · The most common way to calculate your due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that’s how most healthcare providers do it. This method is based on the idea that women typically ovulate about 2 weeks after their period starts and pregnancy typically lasts about 38 weeks.
https://hpathy.com/calculator/pregnancy-due-date-calculator.php
Just enter the 1st day of your last menstrual period below and you can find the expected date of delivery or your due date. Pregnancy, on average, lasts 267 days (38 weeks) from conception. If you positively know your conception date, you can add 267 days to it for your due date.
https://reference.medscape.com/calculator/estimated-delivery-date-pregnancy
EDD by LMP is calculated by adding 280 days (40 weeks) to the first day of the last menstrual period. Gestational Age by US is measured by ultrasound (US) on the Ultrasound Date. EDD by US is the estimated date of delivery based on the Gestational Age by US and the Ultrasound Date.
http://perinatology.com/calculators/Due-Date.htm
The due date may be estimated by adding 280 days ( 9 months and 7 days) to the first day of the last menstrual period (LMP). This is the method used by "pregnancy wheels". The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, and that ovulation and conception occurs on day 14 of the cycle.
https://www.whattoexpect.com/due-date-calculator/
Jan 07, 2020 · Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP).
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