I think it's different for different women. Some do better on the pill and some do worse. I've been on the pill since before I was diagnosed, but when I was younger, before I started the pill, I pretty much always had a day or so of diarrhea (not bad, but it was definitely there) at the start of my peroid. When I started the pill, that all went away. It sort of came back when I was off it before/during trying to conceive, but not as bad as before.
Co-Moderator, UC Forum
Status: Remission since May 2009!
Symptoms began in November 2008, ~4 weeks after giving birth to my son
Diagnosed with pancolitis on 1/30/09
Meds: Apriso (4 0.375g pills ONCE!! daily), mesalamine enema twice weekly, Natural Factors Ultimate probiotic 12/12 Formula, multivitamin. Used prednisone (starting dose 40 mg) to get into remission.