If a patient has unprotected sex but does not want to have an unplanned pregnancy, there is an alternative to the emergency contraceptive pill, which is the intrauterine device (IUD). If a patient chooses to have the IUD placed, it is recommended that the IUD be placed within 5 days of unprotected sex and it will be effective. If it is more than 5 days, then the IUD will not be effective. However, the IUD may not be suitable for everyone. For example, it is not appropriate for unmarried women or women who want to have children to have an IUD. The IUD itself is an intrauterine operation, which has a certain effect on the patient’s body, and it needs to be removed if the patient wants to have children, so repeated intrauterine operations have a greater impact on the patient. Therefore, the use of emergency contraceptive pill is relatively frequent in clinical practice, and it is used as an emergency remedy afterwards. Its success rate is also higher and more convenient.