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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.
Overview. 1  The 29th week of pregnancy marks the start of the third and final trimester. At the start of this trimester, a woman is feeling well but as time passes, her discomfort increases. 2  The third trimester is full of discomforts until the baby arrives.