Hi, I have a Mirena IUD and am currently trying to find someone e...

Hi, I have a Mirena IUD and am currently trying to find someone else who has the problem I've been having. I have always had a moderate period that lasts 3 days. Always, since the day it started, and it has always been as regular as a clock. After having this IUD inserted (which by the way the OBGYN had no interest in making a follow up appointment to check on it at any time) every time I had sex for the first three months it felt like the thing was stabbing me in the ovaries every time my husband...well you get the picture. Once that went away(hopefully it hasn't caused me to become infertile) Now I am getting my period for a week to a week and a half every two weeks! I have seen a million ppl on the internet saying no period after they had their IUD, so why am i having more of them for a longer amount of time?????