I had the short GD test last week and found my results were a little high, so I had to do the long GD test, and the results from that were negative.
I don't eat a lot of sweet stuff, maybe a chocolate bar a week if I'm lucky, and I'm normally pretty good with my diet so I was suprised that the first test said I was high. Try not to worry too much, even if you does come back positive, it doesn't necessarily mean you'll have a big bub.
Good luck
Jodi