Retained miscarriage is when the embryo has stopped developing for a long time and has not been cleared in time or flowed out naturally. The damage to the uterine lining in this case is more serious, sometimes there may be an infection, if the uterus is cleared it is easy to have damage to the uterine lining and adhesions in the uterine lining, which makes it more difficult to get pregnant again. If there is a decrease in menstrual flow after abortion, it is necessary to go to the hospital in time to do a hysteroscopy, if there is adhesion or damage to the endometrium, it is necessary to prepare for hysteroscopic adhesion separation surgery. After the operation, you need to take oral medication or release the ring, and wait for the endometrium to develop normally before you can prepare for pregnancy.