Do I have a hernia?

I have a localized pain to the right of my belly on. When I push it, it feels more firm than the other side. It hurts a bit, but feels good when I pull my waist band of my pants up to that level (a little support). I'm carrying about 20 pounds too much so my fat may be hiding a bulge. I cannot remember doing anything to pull a muscle, and this has been (slightly) painful for about a week. I feel it when I lift something. I have never been diagnosed with having a hernia before, but I had pain in this area a while ago. A CAT scan at that time showed nothing.