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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.
Pregnancy lasts about 40 weeks, and has three phases or stages; the 1st, 2nd, 3rd trimesters. Early symptoms of pregnancy may include constipation, headache, heartburn, extreme tiredness, and upset stomach. Symptoms vary from week to week during pregnancy. A pregnancy test can easily confirm if you are pregnant.