There are precursors to a girl’s pregnancy. Normal pregnancy will have symptoms of menopause, and some women will have symptoms of elevated body temperature, bleeding from fertilized egg implantation, and early pregnancy reaction. 1. Menopause: After a successful pregnancy, the level of estrogen and progesterone in the body increases, and the endometrium will not be affected by the hormones to occur cyclic stripping, menstruation will be suspended, women will observe that menstruation has not been coming after coitus. 2. Elevated body temperature: women who have monitored their basal body temperature will observe a slight increase in body temperature. After ovulation, the ovarian follicle forms the corpus luteum and secretes progesterone, which will increase the body temperature. 3. Fertilized egg implantation bleeding: some women may have a small amount of vaginal bleeding after intercourse for about 6~8 days, which is caused by the implantation of the fertilized egg, and the amount of bleeding is relatively small and the bleeding time is relatively short. 4. Symptoms of early pregnancy reaction: around 2~4 weeks after menopause, some women may have nausea, vomiting, fatigue, dizziness, drowsiness, frequent urination, breast swelling and pain symptoms. Girls with different physical conditions, the reaction shown after pregnancy is also different, appear to have abnormal symptoms to go to the hospital for examination.