Baby measuring big at ultrasound

I had an ultrasound today to measure babies growth and the amount of fluid. I am 33 weeks and baby is measuring at 37 weeks. He is 5lbs. 13oz. They also said there was a lot of fluid but still normal for how big the baby is. This is my third and have never dealt with a big baby like this. Does anyone have a similar experience? Did you deliver early or make it to 40weeks with a large baby? I'm nervous!