I had a high 1st test in my 1st pregnancy but the second test was more than fine......could have been the food (choccie bar) I ate before the test!
Second time around I had slightly high first test and slightly high longer test and controlled GD with diet very easily.
I was highly highly stressed and it is reasonable to be worried but you will get lots of support and know in your heart it is totally managable.
If it was something that can't be managed be super worried but as you can manage it just be careful.
Good luck.
K