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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: 0 - 12 weeks (0 - 3 and a half months) Second trimester: 12 - 24 weeks (3 1/2 months to 6 mths) Third trimester: week 29 - week 40 (6 months to 9 mths) First Trimester. The first trimester of your week-by-week pregnancy is a difficult time. It is a dubious stage when one is not confirmed about the awaited pregnancy but is also an extremely complicated phase when the chances of pregnancy risks are maximum.