what do they do if your baby is measuring really big?

Sh
My OB didn't really want to get into it yet until it's an issue. I am 25+1 and my boy is always measuring 1-2 weeks bigger. He said at my next ultrasound probably 32 weeks they will check his size and if he is still measuring big then we have to look at  why he is so big and then go from there. Will they make me give birth early if he is too big? Also, I had my 1 hour glucose test today, how long before I get the results? Thanks y'all!