The probability of getting pregnant after a ligation is small, but there is a strong correlation with the time of year. Especially in women, women generally do not get pregnant after ligation because the sperm cannot combine effectively with the egg. In men, after ligation, there will still be a lot of sperm left in the vas deferens and seminal vesicles, and it is recommended to also use contraception for three months after ligation. Because ligation only prevents the sperm produced by the testicles from entering the seminal vesicles for storage through the vas deferens again, and there are still a lot of sperm in the seminal vesicles and vas deferens before, and it is recommended that male patients should still wear condoms for three months after ligation.