Gestational diabetes questions

I have GD and just started monitoring my levels 2 days ago. I have to test four times a day; when I wake up, and 1 hour after breakfast, lunch, and dinner. My level every morning before breakfast is always over 100. Is that normal or too high? If too high then what’s the normal level and what made it high if I didn’t eat anything for over 8 hours? Anyone in the same situation? What do you do/eat to keep your sugar levels normal? TIA