Day 16/30 water fast

Today is day 16 of my 30 day Water Fast and until this point i have been doing pretty well (then again, i have fasted before) Unlike my previous water fasts, this time i have hit a plateau. Though i am not obsessed with my weight loss, i am accustomed to dropping about 1/2lb to 1lb a day. My weight has not shifted for 6 days. I am concerned that something is wrong- though i don't feel unwell. I am also concerned that toxins that naturally work there way out of ones system during a Water Fast are being retained by my body. Has anyone experienced something like this before? and most importantly, how did it turn out?