IUD pain during sex

Lauren
Wanted to get a second opinion on this.. I have had a cooper IUD for 4+ years and in certain positions (doggystyle, legs over shoulders) basically any position with deep penetration I feel a pinching and painful feeling on the right side on of ovary. Not sure if anyone else experiences this. 
I have visited the gynecologist and she said everything looks normal so I'm not sure if he IUD is to blame. If anyone has experienced this problem or knows anyone that had please comment!