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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.
Authored by. Dr. Adam Shoman. Week 12 is a significant week in a womanâs pregnancy. It signifies the end of the first trimester and the end of the most critical stage of your babyâs growth and development.eek 12 Tips. During the twelfth week, it is important that Mom continues to take care of herself and her baby. Such irritating pregnancy symptoms as fatigue, morning sickness, and nausea will probably have gone away by now.