Hi,
While tubal ligations are the most effective form of birth control Dr. Yetimyen is correct they are not completly fool proof. The percentage is around 1% but has been as high as 2-3% as well.
If you suspect you are pregnant it is recommended you speak with your doctor as women with tubal ligations tend to have a higher risk of tubal pregnancy's.
Walter
If you are satisfied with my answer please click the *accept button* so I receive Credit for my answer.
**Please consider leaving feedback about me!**