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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.
A lot happens for you in the first trimester, too. 1  A couple of the most common early symptoms of pregnancy you may experience: 2  Morning sickness: Unfortunately it doesn't just strike in the morning â and it picks up by about week 5 of pregnancy. Ginger tea or drops might help, as can small but frequent meals.