Pre-eclampsia may manifest as a small, spotty vaginal bleeding after menopause of the pregnant woman, with a small amount of bleeding in the early stage, often light red or dark red, or bloody leucorrhea, which may last for 4-5 days or even more than 1 week, followed by paroxysmal lower abdominal pain, back pain and lumbago. During pelvic examination, it is found that the opening of the uterus is not opened, the fetal membranes are intact, there is no pregnancy discharge, and the size of the pregnant woman’s uterus is consistent with the gestational week. At a later stage, if the symptoms worsen, it may develop into inevitable miscarriage, when vaginal bleeding and abdominal pain increase and pregnancy tissue may be expelled from the uterine orifice. When a pregnant woman has a preterm miscarriage, if there is no obvious abnormality in the fetus on ultrasound, she can be treated with progesterone to preserve the fetus. Pregnant women should follow the doctor’s prescription and follow the treatment course on time, strictly rest in bed and avoid sex and strenuous exercise during the period. If the pregnant woman has persistent heavy vaginal bleeding, it may indicate the failure of fetal preservation. It can be found under the vaginal ultrasound that the gestational sac has detached from the uterine wall and started to move gradually to the cervical opening. If a pregnant woman has an unavoidable miscarriage, she should promptly remove the embryonic tissue and perform an abortion or surgical induction of labor to avoid affecting future pregnancies due to cervical adhesions.