Guilty over glucose test

Well, the doctors office just called, and my glucose test came back abnormal. It's supposed to be below 130 and mine came back at 203. I now have to go back in a week for the 3 hour glucose tolerance test. Everyone says not to stress about it and that a lot of people fail the first one. But it's so hard not to. I feel like I'm already failing as a mother and not giving my baby a safe environment to develop in. I'm so upset about it. Maybe it's the hormones, or the lack of sleep from working night shift last night, but I feel like such a failure right now. I have diabetes on both sides of my family, so I'm not completely surprised, but was being overly optimistic. Does anyone have any advice for me?