How can you tell the difference between day and the water weight (that is gained)?

Anonymous
How can you tell the difference between day and the water weight (that is gained)

Im 5'4 135 pounds right now

I was 130-143 before but I randomly gained weight and I eat like I normally would and work out

But I haven't been able to use the bathroom except pee

Is it water weight
How can you tell the difference between day and the water weight (that is gained)?
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