Early scan measuring behind after previous miscarriages, honest experiences please

[BoldReader]

Hi all, I’m hoping for some honest opinions as I’m really in my head and struggling.
I have a daughter born 2023 and I’ve had 2 previous missed miscarriages (may & Oct 2025- both at 10w but measuring between 6/7w, heartbeat seen before 2nd mmc), so I’m finding this pregnancy quite anxiety-inducing from the start.
My LMP was 13th Feb. I got my first positive on cycle day 29 (faint), and lines progressed after that, clearblue digital progressed to 3+. My hCG also rose (151 → 517 over 6 days), so things initially seemed okay.
I had an early scan today where, based on LMP, I should be around 6+5. However, they could only see a gestational sac measuring just under 5 weeks, with no yolk sac.
They’ve booked me for a repeat scan next week, but didn’t say much else.
I know dates can be off, and I may have ovulated late (possibly around CD19–21), but I’m struggling to work out if that would explain this much of a discrepancy.
I suppose I’m just looking for honest experiences:

Has anyone had a scan like this that turned out okay?
Or does this sound more like things are not progressing as they should?
I’d really appreciate honesty rather than false reassurance — I just want to prepare myself either way. Thank you 🤍

It isnt an ideal HCG rise. You need around 70% in 48hrs, so you'd be looking at going from 151 on day0, to 256 on day2, 436 on day4 and 741 on day6 minimum. So based on that plus then also being behind, I'd say gently you probably aren't going to get a positive outcome with this one. I will hope for you anyway though. Been through this lots of times, my heart goes out to you.

How are you doing @BoldReader x

Hey thanks for checking in. Just wanted to update after my scan today as I really appreciated the replies before ❤️
This time they were able to see a yolk sac and a fetal pole, measuring around 5+6. There wasn’t a heartbeat yet.
Based on my LMP I thought I’d be a bit further on, but I do tend to ovulate later (around day 18–21 of a 30–32 day cycle), so I’m wondering if that could explain things slightly.
Compared to my scan last week (where it was just a sac measuring under 5 weeks), it does seem like there’s been roughly a week’s worth of development.
They’ve asked me to come back in a week for another scan.
Trying to stay realistic but also taking some reassurance from the fact there has been progression. Feeling very in limbo again though, especially after previous losses.
Has anyone had similar at this stage — measuring behind and no heartbeat yet — and had a positive outcome?
Thank you again for all the support 💛

Wishing you the very best x