Women usually cannot get pregnant after ligation, but there are rare cases such as when the tubes are reopened when the ligature wire is dislodged. If the tubes are cut, a woman usually cannot get pregnant after the ligation. If the tubal ligation is done by tying a knot, there is a possibility of pregnancy when the knot is loosened at the location of the ligation. In addition, this situation also tends to lead to the reconnection of the tubes or the vas deferens lumen, which makes it easy to have an unwanted pregnancy and so on. So even if a woman uses ligation as a form of contraception, there is still a possibility of pregnancy, and no matter which method of contraception is used, it is not always 100% successful. If a woman experiences delayed menstruation after ligation, it is recommended that she consult a doctor in a timely manner, and under the doctor’s guidance, complete the relevant examinations to clarify the cause of the disease and treat the symptoms.