What could be causing me to still be bleeding--10 wks post partum?

I am almost 10 weeks post partum and have yet to stop bleeding. I had a c-section and not sure if that has anything to do with it. My ob doctor doesn't seem to be too concerned.What could be causing me to still be bleeding--10 wks post partum?
Sometimes it is possible for some small bit of placenta to be retained. Sometimes you need intervention of a D&C. With my last child I experienced this. One day I experienced a tremendous cramp out of nowhere and passed a lump of tissue. And the bleeding stopped within a couple days. Don't mean to gross anybody out. But it's usually due to some remnant of tissue. Your body will pass it, or absorb it if possible, or it will have to be removed with a minor procedure called a D&C.
I'd be looking for a second opinion if I were you... I'd be worried about anemia, infection, etc...
dont jus rely on 1 opinion. get a 2nd, because something could be wrong.