I too have GD, but have been able to control it through diet and exercise. I had an u/s at 34 weeks and bubs was measuring 5 pound 3 oz. My OBS said that he would not induce me early as I was not on insulin and he is predicting bubs will be 7.5 pounds to 8 pounds when born. He did say that he will not let me go over too far, probably no more than 7 days. I did ask how accurate the scans are and he said give or take 10%.