Drinking water more than 1/2 of ur weight

I have always been drinking enough water but No Dr. beleive me. My gyno adviced me to drink 12 glasses of water. For last 3 days i kept a log to see .I took 12,14,and 13 glasses of water. But today I checked my ikea drinking glass is of 12oz. So I took 144 oz water daily.Is it too much??? Should I be taking less.Here is riyadh temeprature is 46°C and I dont feel overfilled with water.