I'd be leary about it it could mean higher then normal blood sugars.. I'd call and ask your obgyn.. mine dosnt do glucose till 28 weeks.. but doing it earlier might not be a bad idea for you..
I would say it's normal. And good. Have you been tested for gestational diabetes yet? If you had GD that's the only reason why I wouldn't think constant thirst would be ok, but I was always thirsty in my pregnancy.
clear pee means your hydrated, and being thirsty is jus a "perk" of being prego. I craved ice water that's what I mostly drank and I was always thirsty like I drank almost 2 gallons a day cuz I was so thirsty I carried ice water with me everywhere. I wouldn't worry, and clear pee means your having the lots of water which s good