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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.
What really happens in first week of pregnancy. The truth is that it is possible that you arenât even pregnant yet. When you see your doctor he or she will calculate the due date 40 weeks from the last menstrual period you had.