Gained 3 lbs in one weekend?

I’m a 21 year old male I’m 5’7 and I work at a job where I sweat a lot and I’ve been trying to lose weight and I can’t. Friday I weighed 192.6 and today I weighed 195.6 lbs. How did I gain 3 lbs in one weekend? I don’t even eat that much so it makes no sense for me to gain weight
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