If the patient has intercourse before the IUD removal, the IUD cannot be removed after three days of intercourse. Although in clinical practice, patients are required to remove the IUD within 3-7 days of menstruation, which is a safe period for most women. However, during the safe period, women may also have the possibility of accidental ovulation or accidental pregnancy, so it is recommended that patients should not have intercourse before IUD removal. If the patient has intercourse before the removal of the IUD and does not use good contraception, then it is not recommended that the patient have the IUD removed because there is a risk of unwanted pregnancy. After intercourse, if the patient is able to conceive, it takes about five days for the sperm and egg to combine to form a fertilized egg and to be transported to the uterine cavity through the peristalsis of the fallopian tubes and the swinging of the cilia. The removal of the IUD three days after the patient has intercourse makes it possible for the patient to conceive because there is no interference from the birth control device in the uterine cavity when the fertilized egg is in the bed. However, the endometrium in the uterine cavity will be damaged just after the intrauterine operation, and it is very easy to have a miscarriage after pregnancy in this case, which is a kind of damage to the patient.