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The average duration of pregnancy is 38 weeks (266 days) from conception.Predicting the pregnancy due date based on conception is the most accurate way to calculate one’s due date, but usually the date of conception is not known.Read our most frequently asked questions before submitting your questions.Plentyoffish dating forums are a place to meet singles and get dating advice or share dating experiences etc.
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Last menstrual period is not a good method of dating because it assumes you ovulate on the "normal" day 14, but many women (myself included! Unless you know the exact date that you ovulated, or that you conceived, trust the ultrasound.
Expected day of delivery from ultrasound dating versus last menstrual period—obstetric outcome when dates mismatch Can you improve the answer?
Calculating the pregnancy due date from ovulation is more accurate than from the last menstrual period.
Our pregnancy due date calculator gives you the option of determining your due date from either the date of ovulation or the date of LMP.
But you may want to start: The natural rise and fall of your hormones throughout the month can affect more than you think.