thirsty af!

im 7wks 2 days with baby no3 and have an un quenchable thurst. its so bad my moth is always dry even after couple pints of water. i no thirst in pregnancy is a sign of gd which i had in ladt pregnancy but doc said its to early for symptoms of gestational diabetes as baby is to small. #confused anyone any ideas? (i have the worrt nausea/sickness)