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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.
During the first two weeks of pregnancy, it can be difficult to determine whether you're pregnant. Signs may be subtle. However, if you notice any unusual changes, you may be pregnant. Changes, like changes in your appetite, can indicate pregnancy. You may also notice physical changes like aches, pains, and nausea.