1st pd after misarriage and questions

So sep 19th I had a miscarriage and I got my first pd on the 20th. It so heave that even with a super tampon every hours it is still DRIPPING out of me!!! It's all over my sofa and down y legs and feet. It's everywhere. Has been for 2 days. I'm going to er now but does anyone know why it's doing this!? It's like my miscarriage bleeding all over again.