Question for all you mommies out there! I'm just over 28 weeks along with my little girl (couldn't…

Question for all you mommies out there! I'm just over 28 weeks along with my little girl (couldn't be more excited!), however, I just got my results back from my one-hour glucose test. They say the normal rate is to be under 140, and I came out with 168. So, my doctor has me scheduled to take the three-hour test this upcoming Tuesday. I'm super worried about having Gestational Diabetes because of all the potential things that can result from it (me getting type 2 diabetes after pregnancy, baby being born very large, higher chance of childhood obesity, etc.). From what I've read, Gestational Diabetes effects more women who have either had it before, or have had trouble gaining too much weight during pregnancy. My weight gain is on the lower side of normal, and I have a healthy diet, so I'm just worried of what I'll have to change if I do end up failing this second test. :( Has anyone taken the one-hour test and failed, but passed on the three-hour test??