It takes 3-5 days after the end of menstruation for the IUD to be performed. However, there are certain requirements for the IUD: no intercourse after menstruation and no vaginal washing after menstruation. Before the IUD is performed, a leukocyte test is performed to rule out bacterial vaginitis, trichomoniasis and mycobacterial vaginitis, and washing will affect the test results. If these three diseases are present, IUD cannot be performed to avoid upstream infection. It is recommended that the IUD be performed under ultrasound monitoring to reduce the chance of danger. There will be a small amount of bleeding during the IUD, and the bleeding time will be 3-7 days. It will take half a month before having intercourse after the IUD, so as not to affect the slippage of the ring position.