Oh Sarah -you poor thing. I hope that there is an end to this trauma very, very soon, You saga is very similar to mine and I am now in the TWW after TTC again (with assistance) -so there IS a light at the end of the tunnel!
At my 3rd D&C (7th feb -7 weeks after the 1st) I still had "product" stuck deep into my uterine lining -My Dr did not want to scrape too much in fear of doing more damage. It did eventually all go but only after I got AF. Nature seemed to do a better job in the end than the Dr's!!
Hope your Dr DID get it all and the next bleed you have is a normal AF!