Hi Elsa, I'm sorry your scan wasn't conclusive.
I'm not trying to scare you, but my experience was similar with my MMC earlier in the year. I had to have 3 scans, each 2 weeks apart before they would make a decision. My baby was developing but way too slowly. It broke me because I was 99% sure about my dates and knew in my heart of hearts it couldn't be feasible but had to keep waiting when I just wanted it to be over so I could recover and start again. I was also slowly bleeding throughout though.
If there's a chance your dates are wrong then all might well be fine, but I knew for sure with mine and really should have made this very clear to them because the waiting did my head in. Like I said I'm not trying to scare you, just think it's useful to share similar situations.
I hope you have a better outcome and that your dates are just wrong!