The probability of getting pregnant after a ligation is small, but it is highly correlated with the time of year. In particular, women do not usually get pregnant after ligation because the sperm cannot combine effectively with the egg. In men, a lot of sperm will still remain in the vas deferens and seminal vesicles after ligation, and it is recommended that contraception also be used for three months after ligation. Because ligation is only to avoid the sperm produced by the testicles from entering the seminal vesicles through the vas deferens again for storage, and there are still a lot of sperm previously in the seminal vesicles and the vas deferens, which can only be completely discharged through many times of ejaculation, it is recommended that the male patient still wear a condom within three months after ligation.