28 weeks glucose test 1 hour fail. Help

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Hi everyone. Im 28 weeks and had today glucose test nurse called me and said it was high i need to go for 3 hpur test. Im so worried tk have gd. If i have gd it means i will go tru c section? And what are the risks for baby? If u ladies had experience wkth gd plz share ur stories. I have one child she was oposite she was born with low weight no gd only 5 pounds at 38 weeks