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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 is a time of amazing development. The embryo starts out looking like a tiny seed, then a tadpole with a tail, and then more human. Second trimester. If this is your first pregnancy, you'll begin to feel your fetus move at about 18 to 22 weeks after your last menstrual period.