Gestational Diabetes

So my 1 hour GD test came back super high. They wanted my number to be 135 or under and it was 187. I’m so upset and confused because I eat pretty low carb and low sugar already. I track all my meals and my whole day doesn’t go over 105 grams of carbs and 20 grams of sugar so I’m unsure what I can change and why it’s so high. ? Any advice? Or thoughts?