Hi OP. Just want to give you a rundown from what I remember from my MMC and after.
Had a MMC and advised to have surgical management.
Had a nurse who would bring me back regularly for hCG checks which eventually started to slow down with the dropping so I pushed for a scan (did you get your hCG checked or a negative pregnancy test at all)
Had a check where they said it was fine. But called back by a specialist and found there was RPOC.
Second D&C
No period returned. Huge panic, worried about Asherman's etc. In a huge downward spiral about this (during lockdown)
2-3 months later (I think, but about 4/5 months from first surgery) period returns.
Within 1-3 months of that, not entirely sure, got pregnant for all of 3 or 4 days and then a CP.
Got pregnant on my next ovulation and that was a healthy successful baby.
Had another successful pregnancy since.
Hopefully something from my history may help your current situation.
Good luck and I hope everything works out for you!