How many glasses of water should you be drinking while pregnant? I normally do 7 16.9oz bottles a day and I actually drink nothing BUT water and seltzer water my first pregnancy was very different. I did the "I'm eating for two" and gained 80lbs ! 😳 in 2015 I lost over 5Olbs in 2 1/2 months no exercising , no surgery changed my eating habits. I've been dreading the day I find out I'm pregnant because I'm 100% scared that all my hard work will go down the drain and I will gain a lot of weight again I've been able to maintain this weight off which would have been 2 years in June but now I'm pregnant.