If you have intercourse during ovulation and have no intention of preparing for pregnancy, you can use condoms to prevent pregnancy, which are 99% effective, as long as there is no condom breakage or fistula. Some women who suddenly do not want to prepare for pregnancy after intercourse can take oral emergency contraceptives for 80% contraception as long as it does not take more than 72 hours. In the future, if you do not intend to prepare for pregnancy, you should always use condoms for contraception. If you take emergency contraception frequently, your menstrual cycle may be disrupted and abnormal bleeding during non-menstrual periods may occur, which may have certain effects on your body.