So sorry you are going through this. It is hard mentally when your body reabsorbs rather than expels the baby.
I found when it happened to me, it was worse than any of the other miscarriages.
I know it is of no consolation right now but actually avoiding an ERPC is a good thing if you intend to try to conceive in the future. ERPC's cause scarring and can lead to further miscarriages at a later stage. As I say that does not help you right now, but it might be of some comfort later.
As for what is happening to you rift now, the baby is slowly being reabsorbs into your body (happens commonly in vanishing twin pregnancies). With the size it is now of a small pregnancy sac, you would not know if you pass it or not, as it would be too small to detect visibly.
So with you bleeding (I had no on-going bleeding with my reabsorbs one), you will not know if you pass it or not. This may or may not be of comfort, depends on how you view it.
My hcg levels slowly declined, after scans confirmed the sac was shrinking they left me to "miscarry" at home. As I said I did not bleed, my hpt's gradually got fainter. And after four weeks I got a negative test and I had a very light painless period the following day.
It was hard to not have pain and bleeding while mis carrying on an emotional level. It was so different from my other miscarriages. But it in an odd way now feels different in a good way, she (gender not known but I decided) has stayed with me as a comfort. My big ERPC one flew to France for genetic testing, now that just felt weird!
I know that nothing I can say came really comfort you right now, but I hope that knowing someone else has been there before, might help a little. Let us know how things go, if you need to express your pain here or on the miscarriage threads are a good place to vent. I will be thinking of you.