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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.
Your Babyâs Development. During the first week of pregnancy thereâs no major development of the baby, other than the egg leaving the ovary and traveling to the fallopian tubes. Youâre not actually pregnant at this time, since conception itself doesnât happen until about two weeks after your period ends.octors advise that the first week of pregnancy is your âget out of jail free week.â If your diet isnât perfect, or if you have a glass of wine with dinner, your pregnancy isnât likely to be significantly affected.