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A member asked:
Counting the 2 weeks before you are pregnant and of course when you start your period is it counted 1 week 2 week or 0 week 1 week and so on?
A doctor has provided 1 answer
Period: In the us pregnancy is calculated based on the first day of your last period since very few if any women know their conception date. In a 28 day cycle ovulation typically happens in the middle so 2 weeks after the 1st day of the last period prior to pregnancy, so by the time you conceive you are considered already 2 weeks "pregnant" since the first day of last mentrual - a little confusing!
Answered 8/15/2013
4.9k views
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