Carbo loading before 3 hour glucose test?

Jen
I found out today that I failed my 1 hour test with a 142. The nurse today said that it is a 3 day process to take the 3 hour test. For three days I have to eat higher carbs at every meal plus fruits that like oranges, apples, and bananas. They also want a glass of milk with every meal. On the 3rd day I can't eat past midnight, then I should go in the next morning to start the test. Has anyone else heard of doing it this way? To me I feel like I'm sure to fail since I don't normally eat a high carb diet.