congrats on your pregnancy. Dating scans can be a little off when the baby is so tiny. Even a slight mm measurement can put you out a week. My dating scan was out by 5 days (from when i thought i o'ed) and if i went by their dates i would have got a bfp at 7dpo too - highly unlikely lol. My nt scan was consistant with my dates. I know it will be a nervous 2 weeks no matter what anyone else says but i'm sure its all good and you'll get a better picture of whats happening then