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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.
What happens the first week of pregnancy? Most women are not even aware that they are pregnant. Possibly, the first signs that they might notice could be a missed period, headaches, unusual tiredness and mood swings which they could easily have dismissed as symptoms of stress.