Maybe get another scan for peace of mind but just from my experience with friends etc they arent spot on (talking personal not professional exp here)
Bubs can grow a fair bit in the last few weeks they say anyhow but i would be quizing to find out why she looked so concerned for my own piece of mind!

My bubs were tiny so 6lb i normal to me lol my biggest was 6'10 and my smallest 5'3 so i think i will freak if this one decides to be a whopper LOL

Good luck hope all goes well for you