Pain after sex

I had uncomfortable postpartum sex and the pain is even worse after. I'm not sure if its because it's the first time postpartum (6 weeks) or if its because I had an IUD inserted a week ago. I'm scared the IUD dislodged. My partner said he could feel it. I asked him if he felt the strings or something hard, he said something hard. I read online that neither me nor my partner should be able to feel like actual IUD and if you do call the dr because it might have dislodged. I'm going to call my dr tomorrow. Anyone else have painful sex? It didn't hurt after my first 2 kids and this was the easiest birth yet with no tearing so I wasn't expecting an issue.