Hugs hun. I am sorry for your loss.
My first two losses I had D&Cs, and I bled for about one week heavily, and one week spotting. My third loss was early and a natural loss, and I bled for three weeks - very heavy. I couldn't believe how much blood I lost!
If you're in a significant amount of pain or loosing more than a pad an hour for three hours, then definitely go see the doctor ASAP. We're all different in how our bodes respond to a loss, but bleeding for a long time is unfortunately not uncommon.

Still, if you at all concerned, call your doctor!