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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.
One of the most common signs of early pregnancy, starting about six weeks into your first trimester, is an increase in the frequent urge to urinate. This often lasts through the entire pregnancy. When you are pregnant, the amount of blood in your body will increase dramatically. Thus, a lot of extra fluid will be processed through your kidneys and wind up in your bladder.