Welcome trixmix.
It could be your body having shed the glycogen stores in your muscles and liver, and beginning to produce ketones that is making you thirsty.
The next symptoms you may notice will be the metallic taste, the ketone pee, maybe a little lightheadedness from the reduction in sodium between a regular diet and ketogenic one but hunger will diminish if not disappearing altogether.
Hop on in the Daily chat threads for the latest chat - many good questions are asked and answered there, and you may always learn something new.