Whether or not a spontaneous abortion will stay clean needs to be checked to know, as many women experience incomplete abortions. After a natural abortion, there is usually a bleeding period for a certain period of time, you should wait for less bleeding to go to the hospital to do an ultrasound, so as to determine whether the abortion is clean. Generally after the abortion, the bleeding time may be about 10 days to 15 days, if more than 20 days and bleeding, do not rule out the possibility of residual, if ultrasound examination to determine that the abortion is not clean, it is necessary to do as soon as possible to clear the uterus surgery.