I went in yesterday at 8 weeks 3 days and the ultrasound read a baby at 6 in weeks, dating is much less accuratejust see how the next scan.
I'm booked in for my dating scan monday week so hopefully all will be ok measuring 7+4, 2weeks and 2days behind what i thought i was.
Went in today, 7 weeks, 2 days according to my lmp ahead with the changed date, although it may change again at a later dating scan. I went for a dating scan and thought i was 6w and 5d but they dated me at 5w and 3d i went back a week later and still measured behind but had the right growth within that they say that 2 weeks either side is acceptable.
Based on the date i think i conceived (9th december) 6 weeks is my first scan measured 8 days behind and it was because my cycle was.