Ch-ch-ch-changes

I noticed today that my abdomen is changing. Not just getting bigger or pudgier. It's changing shape. My belly button is starting to push out and the area around it is swelling. I've put on about 5-6 pound so far. About right for twins. But, as a woman who has been a consistent size and shape for 15 years, it's very strange. I can see how women start to feel fat when they are pregnant, even if it's not really fat that they are gaining.