Is it possible to see results this soon?

I've been working out for a little over a week now. I'm not overweight at all, I just want to lose 10 - 15 pounds and tone up. I've noticed that my belly looks a little more thin and my abs are starting to show.

Is this all in my head, because I just feel better about myself for trying to get in shape? Or is it really possible to see result in a week?

Is it possible to see results this soon?
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