Tubal ligation is supposed to be permanent and most often is. However, once in a blue moon, scar tissue can form where you had the tubes cut and sort of make a mini tube. This is not a regular tube and why there is such a high incidence of tubal pregnancies after a tubal ligation. If you are having issues that make you think you might be pregnant, please test. It would be a fluke but again, that event that I just described does happen and tubal pregnancies are dangerous. Good luck and let us know