Right lower pain usually means one of three things.. again I said usually, if it is mid cycle for you and you are ovulating it could be an ovarian cyst, Appendix pain usually starts off general stomach pain that is by your belly button and then moves to your right side, (usually) or you could have DIOS which is where CFers get obstructions at times..
If you are not better, I would get it checked out ASAP, when I had to get my Appendix out it felt like gas pain or that I was constipated, I felt dumb going to the ER but at the time I didn't have a doctor, it was a good thing I did because my AP was almost ready to burst...
Let us know what the results are, hope you feel better
Jennifer