Gestational diabetes

I was wondering if it's okay to get the GB test done at almost 31 weeks? I'll be 30weeks 4days when I go in and they told me it will be then. I even asked to make sure. But I have all these people telling me I should have already had it and that I should already be starting my 2week appointments. (I'm 29weeks 5days right now.) And I feel like I'm so far behind.