Baby suddenly measuring big in 20 days!

Nyva
So I had a scan today at 39 weeks and baby measures around 9 pounds! I had an ultrasound scan at 36 weeks when baby was measuring 5.5 pounds only. Doctor says that this is a sudden weight gain and there could be gestational diabetes for which i am gonna get checked tomorrow. I am feeling extremely anxious as I believe normal delivery is going to so difficult with that weight and I cant really wait till 40 weeks as there would be even more weight gain which is going to be difficult to handle.. 😥 anyone else whose baby measuring too big??