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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 stage of pregnancy brings with it several changes. During the first trimester pregnancy symptoms include a difference in your breasts, exhaustion, nausea and you might need to rush to the bathroom often.he first stage of pregnancy brings with it several changes. During the first trimester pregnancy symptoms include a difference in your breasts, exhaustion, nausea and you might need to rush to the bathroom often.