What Causes Heavy Bleeding After A Tubal Litigation?

i had my tubes tied and in jan of 2005 my whole life I have had regular periods and now im 29 just ended my period about a week and a half ago to 2 weeks. my boyfriend and I have been having unprotected sex and now im bleeding again. it started off real light when I used the restroom and I thought it went away yesterday but I woke up this morning and am bleeding again. this time its heavier than it was yesterday. this has never happened to me