Growth scan!

Stephanie • Mom of two handsome boys Ryker 3-5-14 and Maddox 9-4-15
Had a growth scan and doctor says baby is growing well! He is weighing in at 2lbs 8oz, which she claims is 45th percentile but according to this app that's bigger than the average at 27-28 weeks. And his head is measuring at 32 weeks! My first son was born with a big head too...😳 
Has anyone else had a growth scan? What was baby measuring? I'm nervous because I'm so small framed and had a hard delivery with my not quite 5lber, so I'm nervous this baby is going to be huge!