Gestational Diabetes

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Hello ladies. Yesterday I failed my 1hr glucose test.. I still have to do my 3hr test. I’m only 14 weeks and 3 days. They are keeping a close eye because I had a 10lb baby previously. I am worried I am going to fail the 3hr test. If I do fail it.. what do I have to do? Like what would be my daily routine with Gestational Diabetes? What kind of diet will I have to follow?