I got my lab work papers Tuesday and I didn't even bother to look at them until earlier today and I was like GLUCOSE TEST???!!!! They could of at least mentioned their concerns.
It's good to have it done early if they are worried already about gestational diabetes. Although, it can develop in a matter of weeks and usually later on in pregnancy, I would just give you the advice to request a second testing later on in pregnancy if the first one comes back normal!
I had mine done early as well since they found glucose in my urine, turns out I was diabetic and now have to take Insulin. Its kind of annoying but you just have to excersize and watch what you eat.(ideally what you should do anyway) and I think its better to have the test done early cause if you do have high blood sugar its safer for the baby to get it under control quickly.