The time for IUD is 3-7 days after the menstrual period is clean. Routine gynecological examination is needed before IUD to exclude inflammation that prevents IUD. Before the IUD need to check the routine examination of leukorrhea, electrocardiogram, ultrasound and other routine examination. So can I have intercourse before IUI? The answer is no, even including wearing a condom to have intercourse, it is not recommended. The first reason is that before and after menstruation, the vagina’s resistance is relatively poor and prone to inflammation, so if you have intercourse or wear a condom, it will cause a change in the pH of the vagina and aggravate the inflammation. The second reason is that although the success rate of wearing a condom is relatively high, it is not a 100% successful method of contraception. So if you get pregnant before the IUD, it will be more troublesome to have an abortion at that time, so it is not recommended to have intercourse or wear condoms before the IUD.