Failed 1 hour glucose

So I failed my 1 hour glucose test. The nurse said that my results were just a little above. I go in for my 3 hour tomorrow. Any suggestions? I know there are other factors that make you more prone to getting GD.. But I am so shocked that I failed. I eat healthy and workout reguarly and I'm within the healthy weight gain. I'm wondering if eating before the test was part of the reason why I failed? I know for the 3 HR you are supposed to fast.