Anyone else measured small on fundal height or gone long periods with no growth? Was everything okay at birth?

I’m 37 weeks and still measuring at 31 weeks meaning My bump hasn’t grown at all this year? Surely that’s not normal as this should be the time I’m growing most! Had a growth scan 3 weeks ago and baby seemed to be average size and fluid levels normal. So why have I still not grown? How can I have a 6/7lb baby in there when I’ve only put on 6lbs during this whole pregnancy?!

It’s great that my skin isn’t having to stretch and stuff but I was so excited to have a bump and now it looks as if this is as big as it’s gonna get🙁

Sorry to seem ungrateful. Just worried that somethings not right. All I do is eat! Anyone else had similar experience?