As long as the condom is used correctly and the condom is not broken after examination, pregnancy is clinically unlikely. However, the following situations may lead to pregnancy, is not the correct use of condoms, such as the beginning of sex without a condom, when ejaculation is about to use a condom, this situation may be pregnant. This is because before ejaculation there will be prostate fluid secretion, this prostate fluid contains a small amount of sperm, once this prostate fluid is left in the vagina, the sperm will go down the cervix into the uterine cavity to reach the fallopian tubes, and with the egg combined to form a fertilized egg, and then get pregnant. Therefore, it is recommended to use a condom during the whole process of sexual intercourse so as not to get pregnant.