When birth control pills are taken twice a month it refers to the taking of emergency contraceptive pills, after which menstrual disorders may occur. Taking emergency contraceptive pills is an urgent remedy after unprotected sex and is not recommended as a regular contraceptive because of the high dosage and side effects. When taken twice a month it may cause menstrual disorders and symptoms of irregular vaginal bleeding, which need to be treated in a hospital under the supervision of a doctor. Contraindications such as severe liver function impairment should be discharged before taking emergency contraception. For women who do not wish to have children, they can choose condoms, placement of birth control rings and other safe and reliable measures of contraception under the guidance of a doctor.