The first trimester lasts about 13 weeks and starts exactly before pregnancy. In fact, the first day of your menstrual period is considered to be the beginning of the week of pregnancy. Your adult pregnancy is 40 weeks, so your healthcare provider will calculate for 40 weeks from the beginning of the last period to give you an approximate expiration date. If you are not already with your supplier yet, you can use our schedule to get quick points.
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