Gestational diabetes

Nancy
Hi guys,
I had went through gestational diabetes test during first trimester. It was negative, but i failed the one hour glucose test which means i have glucose intolerance. So dietician asked me to have proper diet n excercise. I am properly following it, but i want to know is there some chances that i can still have gd diagnosed after 24week. I am not eating anything sugar and trying to eat as much protien as i can. Please suggest what are my chances to have gd still??
Thanks in advance!!!