If you want to know whether the condom is broken during sex, you should check it after sex, for example, you can blow air into the open end and then pinch the open end, so that you will know whether the condom is broken. If the condom is broken and the air is quickly excreted, it means that the condom is broken and clinically the sperm will be left in the vagina, which may lead to pregnancy, and it is recommended to take oral emergency contraceptives to remedy the situation. In addition, before using condoms, it is also recommended to do the corresponding examination to understand whether the condom is broken, small loopholes, if not, then give use, so that the purpose of contraception can be achieved clinically, otherwise there is a risk of contraceptive failure.