It may seem a bit strange, but the first week of your pregnancy is actually the beginning of your last menstrual period before you become pregnant. Why is that? Doctors and other health care professionals calculate your due date by counting 40 weeks from the start of your last cycle. That means they count your period as part of your pregnancy even though your baby hasn't been conceived yet. Conception typically occurs about two weeks after the start of your last menstrual period.
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