@VenusStarr it's not the same thing, so I'm not sure this will help you, but... my last pregnancy was a MMC. The embryo grew fine, we saw a heartbeat twice, but the gestational sac didn't grow at all. It was essentially the same size at every scan I went for. The embryo died when it reached the same size as the sac.
There was clearly something wrong, as it clearly didn't grow properly. Our tiny embryo was 7 weeks in size and the gestational sac was just 4.
However our results came back saying "nothing wrong". We were told when we sent it off that they only scan for a certain set of things, so even if you're told it's chromosomally normal, it doesn't necessarily mean that there wasn't an abnormality. This was through the NHS, I'm in SE and it was sent to London at the Tommy's clinic.
Make sure you continue to be your own advocate. You're not a failure, you've done nothing wrong. By being in this group and going through what you are you're proving that you're so strong, resilient and trying your absolute hardest. None of this is your fault ❤️
I'll be thinking of you tomorrow ❤️