Generally, the side effects can be gradually recovered after 3 to 6 months of IUD, after seven months of IUD or blood, it can be considered as ovulation bleeding, pregnancy with device of aura abortion or gynecological lesions such as cervicitis, and many other cases. 1. Ovulation bleeding: in the middle of menstruation, there is a brief drop in estrogen levels, which can lead to endometrial shedding and vaginal bleeding, but the amount of bleeding is usually small, and the bleeding can disappear after a few days. 2. Pregnancy with a device: pregnancy can occur when the IUD is moved down, dislodged or ectopic, etc. At this time, if there is a pre-eclampsia, there may be a small amount of vaginal bleeding, followed by paroxysmal lower abdominal pain and low back pain. 3. Cervicitis: If acute cervicitis occurs after placing the IUD, there is localized congestion and edema, and symptomatic people may have various manifestations such as increased vaginal discharge, vulvar itching, intermenstrual bleeding, or bleeding after sexual intercourse. If there is still blood after a period of IUD placement, you should consult a doctor in time to find out the problem and deal with it positively, and it is recommended to review the condition of the birth control device in time after the operation.