Miscarriages are classified as pre-eclampsia, inevitable miscarriage, incomplete miscarriage, and complete miscarriage. If a clot is found when the patient miscarries, most of them are incomplete miscarriages, where the vaginal bleeding is more than the usual amount of menstruation, and the clot is usually large and will have embryonic tissue trapped inside. During the examination, it will be found that there will be white fluffy-like things inside the clot. If the clot is put in water and floated, it will be found that the fluffy-like things are floating on the water surface, which proves that the embryonic tissue has been shed. If the patient has very heavy bleeding, it is important to go to the hospital early for examination in order to prevent the occurrence of anemia and shock.