Taking emergency contraceptive pills once a year will not cause infertility, but it is not recommended to use emergency contraception as a regular method of contraception.

It is generally advised that emergency contraception should not be used more than three times a year, as it can harm a woman's body. It is recommended that women of childbearing age who do not have a plan should use safe and effective contraceptive methods, including wearing condoms consistently or using an intrauterine device (IUD), which are relatively safe and effective and do not have side effects on health. If using an IUD, it is advised to remove it three months before planning to become pregnant to allow the endometrium to recover before attempting conception, which is better under these circumstances.