Is emergency contraception harmful to the body?

Patient's question:

Patient gender: Female
Patient age: 26
I heard from a friend that emergency contraception pills are very harmful to the body, but I have taken emergency contraception pills twice in the past two months. What harm will it cause, and will I be infertile in the future?

Doctor's answer:

Emergency contraception pills like Yuting, when taken frequently in the short term, may lead to menstrual disorders, but they do not cause other harm to the body. Although it is highly safe, emergency contraception pills should never be relied upon solely—they are only a backup option for failed contraception methods and should not be used as a regular form of birth control. If your sexual partner is fixed and sexual activity is regular, daily contraception methods such as condoms or oral contraceptives can be chosen.