I don't really weight myself that often.. but do take my measurments.. for the longest time my waist has been 24.5 to 25inches.
All of a sudden this week it has jumped to 26 inches.. I havent gained weight, i checked.. but my hip bones are a lot more prominent as well.
I assume i have build more muscle in my abs.. there are pretty hard so i know its not fat, and my hip bones are potruding a bit more because i assume there is less fat there.. Weird the way the body works....