The correct use of condoms during ovulation basically will not be pregnant, because the condom is very good contraceptive effect, by wearing condoms semen will be shot in the condom, will not enter the vagina, so the semen will not enter the uterine cavity will not be pregnant, but the following cases may be pregnant: 1, condom slippage phenomenon, such as buying condoms when the condom is too large, or do not wear the condom correctly The condom may slip off, which may cause semen to enter the vagina and may lead to pregnancy. 2. The condom is damaged, for example, if the condom is used without checking whether it is expired, the rubber may break due to aging, which may cause semen to enter the vagina and may lead to pregnancy. 3. The condom is not used during the whole sexual life, but at a certain stage, and the condom is worn only when the ejaculation is imminent. It is possible to get pregnant.