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Counting The Days Of Pregnancy Q: Is the 40 weeks of pregnancy measured from date of conception, or date of last period?

April 26, 2017conception counting days measured period pregnancy weeks

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Counting The Days Of Pregnancy Q: Is the 40 weeks of pregnancy measured from date of conception, or date of last period?

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Dr. Donnica: It’s from the first day of your last menstrual period, BUT the proper way to state a “due date” is 40 weeks from the first day of your last menstrual period, PLUS OR MINUS TWO WEEKS.