Taking emergency contraceptive pills twice a month may cause menstrual disorders, in addition to some adverse reactions to the drug. 1. Menstrual disorders: the main component of the emergency contraceptive pill is levonorgestrel, the main component of levonorgestrel is progesterone, if you take the emergency contraceptive pill twice a month, it will cause hormone level disorders, which will have a certain impact on the menstrual period, may appear early or delayed menstruation, but also affects the amount of menstruation, appear too much or too little and so on. 2. Adverse reactions: the adverse reactions of emergency contraceptive pills are more, over a month to take two, the symptoms may be more serious, mainly nausea, vomiting, breast swelling and pain, headache, dizziness and other symptoms, but also manifested in the uterus abnormal bleeding. Emergency contraceptive pill is mainly by delaying or stopping the release of egg cells, to achieve the contraceptive effect, but this contraceptive method has greater side effects, it is not recommended to routinely use this method of contraception, it is recommended to take some other contraceptive measures, such as the use of condoms, intrauterine devices and so on.