Appendix/ovary!

After examining a bunch of pictures on Google's image search, I've come to the conclusion that the pain in my side can only be

a) My appendix situs invertis (where it's on your left instead of your right, Eamon's guess)
b) My left ovary (slightly worrying)
c) Part of my intestine (they sure take up a lot of space, don't they?)

..or something else entirely!

I decided it's probably not my ovary because why would it be aggravated by running? And there's probably like a very low chance of my appendix being on the wrong side of my body, and my heart is on the right (left) side of the body so....

I don't know! *throws hands up in air and mutters*

It'll probably go away by itself anyway.