Eat right, exercise.. why am I gaining weight?

I have gained 3 pounds this week. I eat right, exercise (walk 1 mile 2 or 3 times a week, and I do not know why I've gained. I've lost 50 pds. in 8 weeks. I do not drink alot of juice or eat things I am not supposed to, I only eat 3 small meals a day (no grazing) why would I have gained 3 pounds? and I also exercise. Any advice is appreciated.

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