Not to worry about the one measly pound. It could be water weight and will drop just as fast. I'm sure you didn't eat an extra 3500 calories yesterday!
Why are you taking Fahrenheit? I believe there is a thread on it in "Does It Work." Check it out. I really don't know if it could cause weight GAIN.
Change isnít easy. But if you donít change, you stay the same, and whereís the fun in that?