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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.
The fifth week of pregnancy marks the start of the embryonic period. This is when the babyâs body systems and structures begin to form, such as the heart, brain, and spinal cord. Your babyâs heart beats at a steady rate now, though it may not be detected by vaginal ultrasound for another week or two.