With a condom but pregnant, the reason may be the following: a. When wearing a condom, the surface of the condom is scratched, resulting in contraceptive failure. Certain sharp things, such as fingernails, may scratch the condom, so try to use the finger belly when using condoms. Second, use substandard condom products. These products may have tiny holes on the surface or break extremely easily without being noticed and lead to pregnancy. Third, wearing the condom method is not correct, resulting in contraceptive failure. If you don’t wear it at first, but only when you want to ejaculate, the sperm in the male prostate fluid may have already entered the female reproductive tract. On the other hand, if the device is dislodged during sex, there is a possibility of pregnancy. Therefore, the use of quality condoms, and to master the correct wearing method and time, can effectively avoid pregnancy.