There are mainly the following methods to determine spontaneous abortion: first, the patient is determined to be intrauterine pregnancy after the vaginal bleeding, bleeding gradually increased, can be observed white fluffy gestational sacs discharged discharged, vaginal bleeding gradually reduced, can be judged as spontaneous abortion. Second, if the patient in the early stages of pregnancy fertilized egg has just implanted, but ultrasound has not been able to find the implantation position of the gestational sac, you need to determine whether it is spontaneous abortion by dynamically observing the changes in blood HCG and progesterone. If the patient determines that the amount of vaginal bleeding after pregnancy increases from less to more, and then gradually decreases from more to less, and at the same time the blood HCG as well as progesterone decreases very quickly, and then gradually decreases to normal in regular follow-up, it can be judged as spontaneous miscarriage or ectopic pregnancy, and the gestational sac dies and is absorbed naturally and other two possibilities.