I just had my tubes tied three years ago? how would you know if your tubes come untied?

Unintended pregnancy: Rationale for tying tubes (bilateral tubal ligation) is desired infertility aka permanent contraception. Depending upon research/study, tubes become untied approximately 2-10/1000 women (http://sogc.org/publications/tubal-ligation-female-surgical-sterilization/). You could ask for hysterosalpingogram to prove continued ligation (more commonly performed during infertility evaluation). Or get preggo