On my due date they told me my daughter was 10 pounds.. I went 10 more days after that before I was induced and she was 7.5 when she was born. I don't think they can really tell how much a baby weighs. I wouldn't worry to much, it all comes into place :)
With my daughter a day before i gave birth my obgyn was like shes like 6, 6 1/2 lb she was like yur little sou wont have big babies and my surprise the next day she was 8lb 6oz so dnt worry to much
Babies can range from. 5lbs up to 13lbs
If doc isn't worried, don't be.