Ligation is the most effective form of contraception of all, as it is done by cutting off the fallopian tubes on both sides. Generally, the probability of pregnancy after ligation surgery is very low. If the patient has delayed menstruation, first of all, it is necessary to consider whether it is affected by endocrine, medication and environmental, as well as mental factors, but it is also necessary to exclude pregnancy. Because a very small number of patients who have undergone ligation surgery, there is also the situation of tubal reopening after the operation, these patients may also lead to another unwanted pregnancy. Therefore, it is recommended to do a urine pregnancy test first, at the same time, also have an ultrasound examination, according to the specific results of the examination, the corresponding treatment.