I never had any problems with the glucola either - no bad reactions or anything. I had GD with my first pregnancy (a pretty significant case of it too, despite being a VERY healthy eater, and at a healthy weight...please don't insinuate that it's just a bunch of fat cheeseburger eating girls that *give themselves* GD....)
My blood sugars went immediately back to normal after my first pregnancy, and I was screened for Type II one year after the birth, with no problem.
I did the glucola a couple of weeks ago for this pregnancy. I failed the one hour test so miserably, there was no need to do the three hour. Once again, I have been eating healthily (though I will admit I started this pregnancy heavier than the first, but I am not obese or anything.) I have now had a battery of tests with my endocrinologist, and though we are "calling" it GD for now, he thinks I likely have developed Type II. Disappointing, but I for one am grateful to know (I am already on insulin), in hopes of reducing the effect on my sweet son in utero. (My first son was born at a nice healthy weight of 7 lbs 7 oz, and I was also on insulin during that pregnancy, after first trying to control the sugars with diet - as I said, I had already been eating very healthy meals, so the few changes I made in my diet had little effect, unfortunately.)
My point is only that for me, it was nice to know, and MOST mothers with GD are able to control it with diet.
But, I still don't believe that such prenatal tests should be mandatory.