Early scan and dating

I had an early scan at what I thought was exactly 8 weeks.

But the scan confirmed I was 7w2d. Heart rate 168.

I tracked my ovulation. Ovulated CD14 and got a positive digital pregnancy test at 9DPO. Which makes me think being 5 days out doesn’t sound right?

I had an abdominal scan.

Has anyone had a similar situation to this?