Can you get tested again at 39 weeks for gestational diabetes?

I’am really scared because the last time I got tested it was in aug. It has been 3 months now. I passed my first one but I feel scared because for 3 months I got this super sugar crave. That everyday I’ll have at least one or two sugar Snapple drinks or some kind of sweet. Can having a lot of sugar for 3 months straight cause me gestational diabetes? And can you even get tested for it again being so close at birth? 39 weeks

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