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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 can be overwhelming. Understand the changes you may experience and how to take care of yourself during this exciting time. The first trimester of pregnancy is marked by an invisible â yet amazing â transformation. And it happens quickly. Hormones trigger your body to begin nourishing the baby even before tests and a physical exam can confirm the pregnancy.