Baby measuring ahead

Hey...

I’ve had an early scan today n from my positive OPK it made me 7+6 today, my scan the sonographer said I was 8+2.

When I was doing my opks I thought from EWCM I’d ovulated earlier but I didn’t get a positive for few days after, although they were nearly positive it didn’t give a blazing positive til the 18th Feb.

Could it be possible I did actually ovulate a few days earlier??

I know with early scans it’s hard to get the exact due date til 12 weeks

Thanks