@Queenpee21hi,
unfortunately I had something similar happen a few years ago.
private scan was measuring about 5 weeks and had a heartbeat but I knew my exact dates and should have been 7 weeks.
At the time I scrolled and scrolled forums and found lots of outcomes that were quite mixed really, some went back and had caught up and others it was the first signs of miscarriage.
I think I knew it wasn’t good news from the first scan and about 2 weeks later I miscarried naturally.
I know it’s not what you wanted to hear, but I also felt more prepared when it happened reading others outcomes.
I would say is there’s is every chance, especially if you could be unsure on your dates. If you have fully tracked ovulation and your BBT and can pinpoint when this is that’s obviously less unlikely but if not there is every chance you ovulated late.
Another story, slightly different but after a few miscarriages we had early scans with EPU and my last pregnancy was measuring 5 weeks at a 6 weeks scan and I thought the same was happening (although again still a heartbeat and only 1 week difference not 2) went back for a scan at what they’d put at 9 weeks but would have been 10 and baby had all caught up and was measuring 10 weeks. And is now a thriving 2 year old.
Hope it works out for you, the wait is the worst, and I totally get how you’ll be feeling x