Men with only one testicle are overwhelmingly likely to have a normal pregnancy. As long as the testicle on this side is functioning normally, can produce normal sperm, can have a normal erection, can have an effective ejaculation after an erection, and can have intercourse during female ovulation, the likelihood of pregnancy in this case is very high. Therefore, one testicle is not the reason why you cannot get pregnant, as long as the testicles function normally, you can have a normal pregnancy. First of all, a semen test should be performed to assess the quality of the semen. If the semen is of good quality, pregnancy is normal. If the semen quality is not good, the cause of the poor semen quality should be found and then effective treatment should be given.