Pregnancy bleeding like menstruation is usually considered as preterm miscarriage, inevitable miscarriage, incomplete miscarriage or ectopic pregnancy, the specific causes and treatments are as follows: 1. Preterm miscarriage: due to abnormal hormone levels, the endometrium may rupture spontaneously, further leading to blood flowing out, similar to the onset of menstruation, which may be preterm miscarriage, and should go to the hospital as soon as possible for ultrasound to check whether the fetal heart and fetal bud are normal, and can be treated with medical advice with 2. Refractory miscarriage: If the amount of vaginal bleeding increases, the paroxysmal lower abdominal pain intensifies, and the gynecological examination shows that the embryonic tissue is blocked in the cervical opening, then refractory miscarriage may occur. Once the diagnosis is confirmed, the embryonic tissue should be completely expelled as soon as possible, the uterus should be cleared in time, and antibiotics such as cephalosporin and penicillin should be used to prevent infection. 3. Incomplete miscarriage: It can affect the contraction of the uterus, resulting in massive bleeding and even shock. Once diagnosed, it is necessary to scrape the uterus as soon as possible to remove the residual tissue in the uterus and give antibiotics such as cephalosporin and penicillin to prevent infection; 4. ectopic pregnancy: ruptured bleeding from ectopic pregnancy will cause tearing pain in the lower abdomen on one side, often accompanied by nausea and vomiting, and if blood accumulates in the rectal sink of the uterus, there is a feeling of swelling in the anus. This condition is more serious and requires timely symptomatic treatment in hospital, and in serious cases, surgery is needed to avoid life-threatening.