24 weeks with unquenchable thirst?

i am 24 weeks along in my pregnancy and i have been really thirsty for the past hour and a half. i mean i have drank at least 4 tall gles of water, 2 of fruit punch and get this an entire 2l jug of powerade and am still thirsty. why the hell am i soo damn thirsty? what can i drink that will finally quench my thirst?