The condom is not broken, the possibility of pregnancy is very small, the role of the condom is to reduce, reduce the rate of pregnancy and infectious diseases, to prevent sperm from entering the female vagina, sperm and eggs can not be combined with conception, to achieve the purpose of contraception. The material used in the market is mainly rubber, which has good toughness and wear resistance, so if there is no rupture, there is usually no pregnancy. However, even if the condom does not break, the rate of contraception is not 100%, the rubber membrane also has a certain permeability, especially if the quality is faulty or poor quality condoms, sperm may pass through the rubber membrane hole and thus enter the female vagina to cause pregnancy. It is recommended to use condoms correctly, before and after the use of blowing, irrigation check to see if the condom is broken, and need to buy regular manufacturers products to prevent poor quality products to increase the chances of contraceptive failure.