Weight Check; scale problems?

I weighted myself this morning on our bathroom scale. I was really shocked to find that I weighted the same as I did at the doctor's office two weeks ago. I've been on my diet for a week now and I haven't been over 2200 calories in a day for over a week. I should have lost at least 2 lbs by now.

My wife says I could have put on muscle weight, but I think the scale is wrong. I'm going to see if there is a scale at the gym that I can test.

Weight: 280 lbs (home scale)