I started drinking water to help lose weight...but actually gained?

So usually I would only drink maybe 1-2 glasses a day. I read that drinking water would help you lose weight by flushing out toxins. So yesterday I drank 8 glasses and now I am 2lbs heavier...

How long does it take for water to affect your body? Am I gaining weight because my body is not used to the extra water?
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Does water actually help you lose weight?
I started drinking water to help lose weight...but actually gained?
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