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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.
Trimesters of Pregnancy. First trimester is from week 1 to the end of week 12. During the first trimester your body will undergo many hormonal changes which can trigger symptoms in the first few weeks of pregnancy.