Ooh navy good luck! It must be such mixed emotions for you right now, I can't even begin to imagine how you are feeling.
For my GTT I had to have a blood test, drink the syrup stuff then just sit for 2 hours before having a second blood test. Should get the results back on Monday. I'm in England but when I told my sister who lives a couple of hours away from me they did it slightly different for her as well so maybe it's just different every where including if you're in the same country?