I found a hard lump in the lower right quadrant of my abdomen.?

I have been working out pretty steadily for about 2 months now and about a week ago I noticed a lump. It is pretty hard and doesn't hurt. I am getting it checked in about a week, just wanted a little peace of mind until then. Was wondering if maybe it had anything to do with working out? Any ideas what it could be (that won't scare me ). Thanks.