Strange ache on my right side of my stomach. What do you think could be wrong with me?

Since yesterday morning I’ve had this strange weird ache on the right side of my stomach. I’ve never had this feeling before. The pain feels tight, kind of swollen, and tender; like I’ve been kicked in the stomach. I only feel the pain when I move, stand up, or walk. I haven’t done any exercise or anything. The pain isn’t giving me too much grief, it’s more of an annoyance if anything. I’m not in agony. As I said, if I don’t move, I don’t feel it. But it does really hurt when I do move. I know about appendicitis but I’m doubting it’s that because I don’t have a fever or sick feeling with it.