Just diagnosed

So i am 29 weeks pregnant and i did my glucose test last wensday and my hour was 180 and my 2 hour was 160. I figured i was gonna fail since I’m obese. I’m feeling very overwhelmed i do not know what foods to avoid or what to eat and when to eat or how much exercise is good enough..i just want to be healthy. I was wondering if maybe i was diabetic before i got pregnant. I did a blood test August 28th and my A1c was 5.4 and my gluclose was 100 after eating egg and ice cream sundae..so did i recently just develop GD?