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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.
We've compiled this pregnancy week by week article because we know you're probably dying to know what happens next! Each week in your first trimester brings new and exciting developments â your baby is only tiny, but this stage lays important foundations for the rest of his or her life!