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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.
1 Sometimes a small amount of spotting or vaginal bleeding is one of the first signs of pregnancy. 2  Known as implantation bleeding, it happens when the fertilized egg attaches to the lining of the uterus â about 10 to 14 days after conception.