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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.
First Trimester. The first trimester consists of weeks 1-12 of pregnancy. The first trimester is a very important time during pregnancy, when all of the pieces are falling into place to grow a healthy baby. You may not look pregnant during your first trimester, but you can be sure that many changes are taking place.