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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.
Your Body at 40 Weeks of Pregnancy (Internal) At full term, or 40 weeks of pregnancy, the fetusâ head has generally lowered into your pelvis, where it takes up most of the space. This is called âlightening.â In first pregnancies, this may happen a few weeks before labor.