Normally, if you wear a condom to have sex, you may not get pregnant. However, the contraceptive rate of condoms is only about 90%, so there is a 10% chance that you will get pregnant. Pregnancy refers to the combination of sperm and eggs to form a fertilized egg. The fertilized egg is implanted in the process of uterine cavity development and maturity. If the condom is worn properly, it can prevent sperm from entering the female body, block sperm egg binding, and reduce the possibility of pregnancy. Besides the contraceptive effect, the condom itself can also prevent sexually transmitted diseases, which is a recommended measure in medicine. However, it should be noted that the use of condoms must be standardized. First, the use of condoms throughout the whole process is required. Second, it should be noted that its size is consistent with the male external genitalia.