Women should not have intercourse until half a month after the placement of the IUD. This is because there will be a small amount of vaginal bleeding, lower abdominal pain and other discomforts for a short period of time after the IUD is placed, which will last for 3-5 days. In addition, women should pay attention to appropriate rest after the placement of the IUD, to avoid the occurrence of cold and flu, premature coitus will lead to vaginal bacterial infection and the occurrence of uterine infection, pelvic inflammatory disease and so on. The time for women to place the IUD is 3-7 days after menstruation, during which time the IUD can play a good role in contraception due to the thinness of the uterine lining, which is less prone to bleeding and rejection. When a woman bleeds vaginally for more than 10 days or experiences lower abdominal pain or lumbago after placing the IUD, she needs to go to the hospital for an ultrasound examination to rule out the possibility that the IUD has moved downward.