Apparently there is such a thing as ovulation pain. I'd suspected that that's what it's been, but words I learned in high school (you can't feel it when you ovulate, idiot) had me thinking it could be something more serious.
It's only in the last year that I've started having one-sided abdominal pain at times of the month that I haven't been expecting it, lasting a few days. And as it's always been on the right side, I've been worried about my appendix. I've been paranoid about it ever since my brother's burst when he was twelve.
Fun it isn't, but damned if I'm not relieved.