Not as much for the period pain, but my ovulation pain affects my pouch big time. Did as Jan spoke previously: I went on birth control pills to control it all, and things are fine. I'd suggest it, too, if you're not on something already.
Prostaglandins released during periods affect you and make you poop. Even "normal" women are affected. See this site:
http://www.everydayhealth.com/...and-your-period.aspx