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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 weeks are grouped into three trimesters. The first trimester is the time in between fertilization of the egg by the sperm (conception) and week 12 of a pregnancy. A woman's body goes through many changes during the first 12 weeks of a pregnancy. Women often start to have concerns over: what to eat.