Two periods a month?

So I've been using the copper IUD (Paragard) for close to 11 months now. At the begining I was spotting in between my periods and I was told that was normal. Six months in I started to have heavier spotting and I know this is not my period because This tends to happen around my 18-19 cycle day and I get my period right after around day 28. The thing is that I'm no longer spotting but bleeding as if its a normal period but with no cramping or any kind of period symptoms besides the bleeding. I had previously talked to my doctor and she told me I might have a hormonal imbalance because I was on the Nuvaring for 3 years. I was just wondering if this has happened to anyone before?