Accidental abortion can be completely clean, chorionic villi metaplasia completely flow out, review ultrasound in the uterine cavity is quite clean, the uterine cavity line is relatively clear, but there are some accidental abortion abortion is not clean, chorionic villi fall down, the whole large metaplasia in the uterine cavity resulting in an incomplete abortion, a large amount of bleeding, when necessary, to do the purging operation. The clean abortion depends on the amount of bleeding, most of the abortion is incomplete, the amount of vaginal bleeding will be larger than the amount of ordinary menstruation, and the time is longer than the time of menstruation, blood dripping. Therefore, you should go to the hospital as soon as possible to review the ultrasound, transvaginal or transabdominal, if there is not much blood, and it is not convenient to hold urine, you can also do transvaginal ultrasound, see more clearly. If there is something uneven and strong echo, consider the possibility of fetal membranes is more likely, and the bleeding is more, to consider doing a purging operation, and there are also some flow more clean.