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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.
The First Trimester of Pregnancy. Week 1 & 2 â Gestational Age. Your menstrual period has just ended, and your body is getting ready for ovulation. For most women, ovulation takes place about 11 â 21 days from the first day of the last period. During intercourse, several hundred million sperm are released in the vagina.