Here it is anywhere between 24 and 28 weeks. I'd ask your doctor. If you have it then sooner is better in terms of treatment and healthy outcome.
I had gestational diabetes with my first one that went too long undiagnosed. I ended up with complications and premature early c-section. Good chance you don't have it and I hope you don't. Good luck :)
In Austria they do it at 24 weeks. I'm in week 21 now!
I'm having mine tomorrow and tomorrow I will be 27 weeks. It's normally26 to 28 weeks.
Between 26-28 weeks. At your next apt. They should make the following apt for that! Good luck: -)
Probably anytime soon. You could ask your doctor at your next appointment