After early expectancy can cause the uterus to increase in size and pelvic congestion. When women experience stomach pain and bleeding when they are newly pregnant, consider that it may be caused by the following conditions: a. If it happens to appear within 10 days after intercourse, consider that the fertilized egg has just been laid, resulting in bleeding caused by a small amount of endometrial shedding, which can also lead to hidden pain and discomfort in the stomach when the endometrium is peeling off. If it appears within 30 days of menopause, it is considered to be caused by pre-eclampsia or biochemical pregnancy or ectopic pregnancy. If it is caused by pre-eclampsia, HCG can appear to double every other day and progesterone is relatively low, so progesterone should be taken for fetal preservation treatment. In the case of biochemical pregnancy, the bleeding will gradually increase with time and the abdominal pain will be the same as menstruation. In the case of ectopic pregnancy, a small amount of bleeding and vague abdominal pain will occur repeatedly without rupture of the mass.