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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.
How Pregnancy Happens at a Glance. 1  Pregnancy begins when a fertilized egg implants in the uterus. 2  Getting pregnant can happen in different ways.  Understanding your fertility pattern can help with avoiding pregnancy as well as getting pregnant.