The first time not inserted before the condom put on the reverse, and then put on again generally will not be pregnant, but is not absolute, should be analyzed in conjunction with the specific circumstances. If the condom is worn backwards before insertion, and the condom is removed and put back on in time, as long as there is no semen left on the condom, and the condom does not fall off or break during intercourse afterwards, it will not result in an unwanted pregnancy. However, sometimes there may be a small amount of prostate fluid when a man is sexually aroused. If a small amount of semen is left on the condom when the condom is removed and put back on after wearing it the other way around, the small amount of semen left on the condom may be allowed to enter the body and combine with the egg, thus leading to an unwanted pregnancy. Or if the condom breaks or leaks during intercourse because it was not put on properly, it can also lead to an unwanted pregnancy. If the condom was worn backwards before insertion, there are individual differences in whether or not you can get pregnant again. It is recommended that you check the condom to see if there is any semen left on the condom, or if it breaks or leaks after intercourse.