I've been very thirsty for the last few weeks. Had put it down to being simply yet another pregnancy symptom (!). Is it? Or should I be worried about gestational diabetes? I thought it only developed in the third trimester but tonight I literally cannot quench my thirst (have drunk 1.5 pints in last hour and still thirsty!) It's like one of those horrible dreams where you drink and drink...my tummy is so full now that I can't go to bed!