Big baby, higher fluid- advice?

Katie
I'd be grateful for any knowledge from other moms delivering big babies or with excess fluid...we just had a sizing ultrasound today at 37w6d (I have diet controlled Gestational diabetes): 
7lbs 11oz, 83rd percentile today (still considered normal until you hit 90th percentile...but still! That's close). Heart rate 130. Fluid levels a little high at 21.4- likely a result of a big GD baby who pees more (last time it was 10, range is 7-24). Will discuss with OB on Monday. Anyone else had any similar experience?