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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 Week Pregnant â Your Baby. In the first week of pregnancy, your baby is still a small, single celled egg, hiding in one of your ovaries. This egg is called an ovum and is only just visible to the naked eye. Itâs completely unaware of whatâs about to occur! 1 Week Pregnant â For The Men.