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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.
Week 8. The eighth week of pregnancy is a special one, because at this point the precursors to all organs have been formed. Philosophers therefore argue that with the beginnings of a brain, the fetus now has the ability to think and react, and that marks the onset of life.