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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 lasts for about the first three months of pregnancy, and is usually the time when a woman realizes that she is pregnant. During the first trimester a woman may experience nausea, extreme tiredness, headaches, mood swings, and several other symptoms.