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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.
Morning Sickness. Nausea and vomiting can be one of the first signs of pregnancy and usually begins around the 6th week of pregnancy. It can occur at any time of the day, and for most women, it seems to stop after the 12th week of pregnancy.