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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.
First trimester pregnancy refers to week 1 to week 12 of the week-by-week pregnancy wherein week 1 is calculated from the first day of the last menstrual period. Technically therefore, there is no pregnancy in the first two weeks of the 40 weeks of pregnancy.