As long as it is an emergency contraceptive pill, there are no clinically significant side effects. Because the emergency contraceptive pill is a highly effective progestin, it contains an amount of progestin equivalent to five times that of ordinary contraceptives, so it can cause relatively large side effects. Because the emergency contraceptive pill inhibits ovulation of the ovaries and breaks the normal physiological ovulation function of the ovaries. Therefore, it can lead to endocrine disorders and menstrual disorders, and there is often withdrawal bleeding after taking the pill, so the side effects of the emergency contraceptive pill are very significant. It is advisable not to use the emergency contraceptive pill as a regular contraceptive, it is better to use condoms during sex to prevent pregnancy, and there are almost no side effects. If you are not planning to get pregnant for a long time, it is advisable to use the IUD to prevent pregnancy.