Paragard?

I had my baby boy Jan 23. First pp period 3/10 and the paragard put in 3/20. Had my period again 4/10 but now its 5/12 and no sign of period. My boobs are really sore to the point that it hurts when my son latches and im having a lot of discharge. I didnt experience either of those thing before my last 2 pp periods. I did take 2 pregnancy test and they were both negatives. I was told that the iud wouldn't affect my period but i think it has if im getting new symptoms and my period is late, have any of you ladies experienced the same?