Drinking loads

Laura • Married 30/8/14, little boy lochlan
I'm 6 weeks 2 days and I e been drinking loads of water throughout the day not because I'm thirsty but I I get a very dry mouth and I need to drink - v weird- I'm not peeing loads though which is weird because the amount of water I'm drinking surly would normally make me go 4+ times a day! Do you retain water in early pregnancy?