New to GD

Sasha
I am 30 weeks tomorrow and found out I failed my 3 hour test today. My numbers were:
Fasting 66
One Hour 181
Two Hour 175
Three Hour 143
I'm feeling horrible about this. I don't mind the diet, since I'm not a huge dessert person anyway, but I still feel like this is my fault for not being more conscious of diet and exercise since I've been pregnant. Even though I KNOW that's not the case. I've always been thin and healthy, so I just didn't expect this at all. Any words of encouragement?