Paragard IUD.. I'm in pain!

I just got it on Thursday April 10th, and I was not on my period. When inserted, the pain was really bad. On a scale from 1-10 it was a 6. I went home and I was in pain all day, I could barely walk around my house. I began having little bleeding and brown. Now it has became heavier bleeding, and I'm still in pain. I really feel like my body might be rejecting the IUD. Can someone please give me some advice based on your experience :(