When a woman has redness of vaginal bleeding and stomach pain in the first month of pregnancy, the following three causes are considered: First, it is considered to be caused by biochemical pregnancy, as the fertilized egg fails to settle in the uterine cavity, the estrogen and progesterone and HCG in the body will drop, thus it cannot maintain the growth of the uterine meconium and the meconium tissue is shed, which causes abdominal pain and redness, and the bleeding will be more and more. Secondly, it is considered to be pre-eclampsia miscarriage, mostly due to the low level of progesterone and the shedding of a small amount of endometrium, the amount of bleeding is not much and the abdominal pain is not serious. Thirdly, the ectopic pregnancy is caused by the fertilized egg being laid outside the uterine cavity.