Taking the pill twice a year can easily cause endocrine disruption, menstrual disorders, nausea, vomiting and irregular bleeding. Emergency contraceptive pills are usually taken within a few days after unprotected sex, which is more damaging to the body. Emergency contraceptive pills should be considered only when there are no other contraceptive measures, and emergency contraceptive pills should not be taken more than three times in a year. Emergency contraceptives are very irritating to the gastrointestinal tract and can cause nausea, vomiting and other gastrointestinal effects after a single dose. The main component of emergency contraceptives is progestin, and taking a large amount of progestin at once can easily cause endocrine disorders and menstrual disorders, and can also lead to irregular uterine bleeding and even infertility. Women who do not intend to get pregnant are recommended to take condoms, which are safer and more effective, do not affect future conception, and can also avoid some infectious diseases.