The characteristics of pregnancy are as follows: I. Menopause, women of childbearing age who usually have regular menstrual cycles and have a history of sexual intercourse and have menopause for more than ten days are highly suspected of being pregnant. Early pregnancy reactions, such as nausea, morning sickness, fear of cold, dizziness, salivation, weakness, drowsiness, aversion to greasy food and acidic food, etc., mostly disappear on their own in about three months after menopause. Third, breast changes, self-conscious breast swelling and pain, breast enlargement gradually, with obvious veins showing, nipple enlargement, nipple and areola color deepening, sebaceous gland hyperplasia around the areola appearing dark brown nodules. In case of lactating women, milk secretion will be significantly reduced after pregnancy. IV. Frequent urination is caused by the pressure of the bladder by the anteriorly enlarged uterus, which will disappear naturally when the uterus enlarges beyond the pelvis.