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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.
Cramping During Pregnancy: Causes, Treatment and Prevention. During the first trimester, cramping often results from normal changes that occur during your babyâs development. Cramps can generally be described as pulling sensations on one or both sides of your abdomen. Although not considered a symptom for detection of early pregnancy, it is a symptom that accompanies many pregnancies.