Can you get pregnant unexpectedly after tubal ligation?

Female tubal ligation is sterilization surgery, generally will not be pregnant. Tubal ligation surgery, is the two sides of the tubal disconnection, ligation. However, tubal ligation surgery, there will be a chance of accidental pregnancy, the probability of accidental pregnancy in about 2%-3%, occasionally there will be tubal recanalization. If the performance of menstrual delay, can be tested by blood HCG to determine whether pregnant. Generally, it is caused by the detachment of the ligation ring, causing the egg to enter the uterus and causing pregnancy.