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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.
Symptoms of First Week of Pregnancy. Most of the women are not even aware if they are pregnant during that first week of pregnancy. One of the earliest symptoms of pregnancy could be a missed period coupled with uncommon fatigue, headaches and mood swings caused by hormonal changes in the body.