There is also a possibility of unwanted pregnancy after ligation, but the chance of this is low, between 1% and 2%, because there is no 100% medical possibility. Also, there are many factors that can cause another pregnancy, sometimes the ligation site is lower, or even the ligation site is not particularly strong, which can cause an unwanted pregnancy. After ligation, ectopic pregnancy may also occur because the sperm and egg cannot reach the uterine cavity after ligation, and they may be laid in the fallopian tubes, thus causing ectopic pregnancy. Therefore, you should try to test for pregnancy with an early pregnancy test about 12 days after intercourse to rule out any pregnancy. In addition, you can also go to the hospital for an ultrasound at around 42 days to rule out any adnexal mass or ectopic pregnancy.