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Pregnancy Week by Week: One Week Pregnant. During the first week of your pregnancy, you are not actually pregnant. Conception usually occurs about two weeks after your period begins, which means that your period is counted as the first part of your pregnancy, even though you were not pregnant at the time.
3 Weeks Pregnant: Spotting the First Signs of Pregnancy. When you're 3 weeks pregnant, your baby is officially beginning to grow inside, even if she is only a bundle of cells at this point. share. week by week pregnancy. You're 1 week pregnant on the first day of your last menstrual period, even though you haven't actually conceived yet. share.  When you're 3 weeks pregnant, your baby is officially beginning to grow inside, even if she is only a bundle of cells at this point. share. week by week pregnancy. When you're 36 weeks pregnant, you're almost at full term, and your baby weighs about 6 pounds and measures roughly 18.5 inches long.