LOTS of things effect the scale - scales don't measure just fat, they also measure water, food, etc. that are in your body. So if you have a little extra sodium and are retaining some water, that shows on the scale. If you are hormonal and retaining a little extra water, that shows on the scale.
It would be impossible to gain 5 lbs of fat in a week without serious binging, and you kept your calories in check, so that's not the case. Drink a lot of water and it should go down in the next 3-5 days.
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