Lozzy. I am so sorry for your loss. Nothing is more heartbreaking than losing a baby. To have medical complications just adds to all the hurt and confusion.
I am very experienced with 'retained product" as they like to put it. I have had 4 m/cs and had retianed product with 3 of them, requiring 2 x D&Cs with 2 of them.
Several of the surgeries were done by different drs so although i was angry after the first time i had to go back to surgery, I have now realised, that it has likely been an issue with my body not wanting to let go than any fault of the drs.
As previously mentioned, the Drs cannot be to aggressive in a D&C for fear of damaging your uterus. Sometimes it is just bad luck to have some remain.
With my most recent m/c. my Dr did an u/s at the time of first sx and thought she had it all out. 1 week later I knew something was wrong and confirmed a bit of placenta still remained. We werenot keen for more surgery given i have had far to many D&Cs over the yrs. Tried misoprotol ( prostaglandin tablet) which is inserted into vagina daily for few days. acts to contract your uterus and hopefully expel the retained product . Works well for some people but sadly for me just made me really sick and very painful. Product stayed firmly attached so went back for more sx bu my Dr did it with u/s guidance and hysteroscopy( camera into uterus) so she could just visualise and grab that last piece without traumatising the rest of my uterus.
Hoping you can get this sorted out quickly. I know how truly awful it is to have things drag on so badly when all you want is your baby back alive and well.