37 week scare:(

I went today for my 37 week check up and my doctor  checked my cervix and it was closed I'm have a c section planned July 1 but she wanted to make sure. Then before I was leaving she sent me to ultrasound to check my baby was growing ok and the ultrasound tech said my baby was only weighing 5lbs and he didn't want to move for her at all! And they had me monitored for awhile I know he moves he was just being lazy I guess total scare today 😭 But I want to know if my baby is small for 37 weeks I've gained 26lbs And I eat a lot I would figure he would be a little More has this happened  to anyone😢😭