The so-called safe period is relative and there is no absolute safety. It is recommended that emergency contraceptive drugs should be taken as soon as possible within 72 hours after unprotected sexual intercourse. Contraceptive drugs have side effects such as menstrual changes and irregular bleeding, so it is not recommended to take them often. Condoms are preferred, and other contraceptive methods, such as in vitro ejaculation, contraceptive drugs, and safe period contraception, are not 100% effective. If you have delayed menstruation after intercourse, or irregular bleeding that lasts for a long time, after 10 days of intercourse, you need to test the early pregnancy test or check the blood HCG to rule out the possibility of pregnancy, you need to check the ultrasound to see the intrauterine situation, it is not recommended to take contraceptive drugs frequently as a remedy after intercourse.