Hi My Name Is Vanessa. I Had My Tubes Tied

hi my name is vanessa. i had my tubes tied for over two years now. but ever i started my period they have been irregular. i had no problems before i would a month without starting. then i would start. but i've never gone this long without starting my last period was in july. now it's four months later n i still haven't started . what could that mean? i'm starting to get a little worried.