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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 second trimester. The second trimester of pregnancy starts at week 13 and lasts until week 28. The second trimester has its fair share of discomforts, but doctors consider it a time of reduced nausea and greater energy. At the start of the second trimester, your baby weighs nearly 1.5 ounces.