I have had 3 scans with this pg so far. first one they said i was BEHIND. I was 6w4d and was told it must be less than 6w cos they couldnt see anything. second one i measured EXACTLY as my own dates should have, 12w6d. Third one I measured IN FRONT by a week. I was 184d and they said i was 19w5d.

so i just go with my own date! I am pretty confident I got it right and u/s are really not all that accurate.

(also with dd2 i was told she would be 10lb PLUS and she came out the next day at 8lb14.)