Period Question??

Daisy

So i have a question about my period. Some background info about me: i got my paragaurd iud inserted in november 2015. My periods have always been regular and not heavy at all even with the iud in place and always come at the same time. Last month my period came almost a week late but it came (thank god) ! Now this month it came a week early for some weird reason and now i'm on day 8 and i still have a heavy flow , is this normal ?? should i go to the doctor ? Help :(