Taking birth control pills twice in a week may cause side effects such as prolonged vaginal bleeding and menstrual disorders, and need to be taken under medical supervision. Emergency contraceptive pills are effective as an emergency remedy for unprotected sex or after contraceptive failure, and can be taken within 72 hours after sex. However, the emergency contraceptive pill is a compound preparation of estrogen and progestin, and the dosage is large. Taking the pill twice a week may cause side effects such as prolonged vaginal bleeding and menstrual disorders, so it cannot be used as a regular contraceptive measure. Contraindications such as hepatic and renal insufficiency should be ruled out before taking emergency contraceptive pills, and adverse reactions such as nausea and vomiting may also occur after taking the pills. Emergency contraceptive pills are only effective for one unprotected sexual intercourse, and other contraceptive measures should be taken when having intercourse again. For women who do not wish to have children, short-acting contraceptive pills and condoms can be used under the guidance of a doctor.