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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.
Pregnancy: The First Month. Physical changes in the first month of pregnancy. The first month of pregnancy begins in the third week after your last menstrual period. During week three, the egg cell is fertilized by a sperm cell in the fallopian tube. The fertilized egg cell travels through the fallopian tube to implant in the uterus.