The Whole Period of Pregnancy Can Be Divided Into Three Stages:. The first trimester (early pregnancy): 1-12wThe second trimester (middle pregnancy): 13-27 wThe third trimester (late pregnancy): 28-40w. The Diagnosis of the First Trimester. 1.History and symptomsA. Cessation of menstruation This is the first frequent symptom of pregnancy, although a few women may have slight bleeding after conception. But amenorrhea is not only due to pregnancy but also other reasons. Women of breast feedin9452
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