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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.
1 The first week of pregnancy starts with the first day of a woman's menstrual period. She is not yet pregnant.  During the end of the second week, an egg is released from an ovary. This is when you are most likely to conceive if you have unprotected intercourse.