Feeling pretty terrible

I just got the call from my doctor on the results of my glucose test today. And he said I failed my test, so I have to go back tomorrow for the 3 hour test. And that more than likely I have gestational diabetes 😭 so he will put me on a special diet, and if that doesn’t work I’ll have to take insulin. I am terrified, and angry with myself! I feel like I did something wrong that caused this? Anyone ever fail the first test but pass the 3 hour? I’m so sad right now. Just looking for some friendly advice and info on it from those whom didn’t pass their test either. Thanks ladies.