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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.
Lower back pain is just another part of pregnancy for many pregnant women; however it doesnt make pregnancy any easier. There are no clear answers why back pain occurs in the first trimester although that is the first sign of pregnancy for many women.