Nothing is 100%: Even w/permanent contraceptive methods, there's still a small but real chance of pregnancy. With tubal ligation, it's reported at 2-10% although latter might be a bit on the high side. Check out http://www.sfgate.com/news/article/Surprisingly-High-Failure-Rate-for-Tubal-Ligation-2985708.php & http://sogc.org/publications/tubal-ligation-female-surgical-sterilization/. BTW 17yo seems young for TL
Answered 5/27/2015
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