Help with dating/early scan

[Whattodooo22]

Hi everyone I have pretty irregular periods cycle lasts between 28-35 days. The first date of my last period was 30th Aug, and I ovulated between 14th-16th September (i think it was likely 16th) I had stark negative tests up until 25th September when they started faint.
I am going for an early scan on Saturday and I am wondering what I should expect? If going off last period I would be almost 7 weeks and expecting to see a heartbeat, but I'm unsure what way they will date me/what I should expect? I am so nervous due to previous losses and no living children. I just dont know should I panic if there is no heartbeat and Im measuring 6 weeks or could that be normal? I know this is all "what if's" but I dont know what to prepare myself for really.

Thank you

If you ovulated latest 16th Sept you’d be 6+3 on Saturday I’d make it, so not a lot in it. When they’re that small the measurements aren’t entirely accurate as you’re talking a fraction of a mm.
I knew my dates and still was measuring nearly a week behind at my first scan but by the next one they’d caught up (I had weekly scans at EPU due to previous losses) so I wouldn’t panic if they measure you slightly less x

Thank you xx did you see a heartbeat at the early scans?

Yes we did, my first scan I thought I was nearly 7 weeks but they measured me 5+5, there was a teeny flickering heartbeat ❤️

Amazing! Hope I will have the same success xx thank you