Usually, the duration of bleeding from a preterm miscarriage is difficult to determine and needs to be analyzed on a case-by-case basis. If the pregnancy is successfully preserved after a preterm miscarriage, the vaginal bleeding will usually stop within a week and the symptoms will disappear. However, if the symptoms of pre-eclampsia do not disappear and tend to worsen gradually, and eventually form inevitable or indolent miscarriage, the vaginal bleeding may last for a long time, possibly up to one month. Therefore, if symptoms of preterm miscarriage occur in early pregnancy, such as vaginal bleeding or lower abdominal pain, it is important to go to the obstetrics clinic of the hospital in time for corresponding treatment to preserve the pregnancy. Patients can use progesterone or Chinese herbal medicine to preserve the fetus, apply hemostatic drugs if necessary, and review regularly to try to preserve the fetus successfully. In addition, women in early pregnancy must pay attention to regular diet and rest, avoid staying up late and stress, to avoid the symptoms of preterm abortion.