Please help?? Tmi no pic.

I was 3 weeks 2 days late for my AF which should her ugly face yesterday.. its really really heavy and I'm doubling up on pads.. I'm going thro 2 pads an hour I never get period pain but this is killing me do anyone think i should go see a doctor or could it just be like this because I was late ?? I'm never late so haven't had this before