Miscarriage: should I be concerned?

Jenna
So I had a miscarriage in September. It was the most painful experience ever--and I have a high pain tolerance! The baby stopped growing at 6 weeks. Anyways, I bled for about a month after. Then after that my periods were completely normal until now. So my period ended Dec 14th, but then started bleeding again Dec 18th and since then haven't stopped bleeding. And this whole "second period" thing is super heavy and clotty. A little worried because after my miscarriage was through, my periods have been pretty light and regular until now. What do you think this could be???