Even when I'm pretty stable, I can always expect IBS attacks during the first few days of my period (actually my period usually arrives with the fanfare of D attack... lovely!! ) I just usually try to eat really safely (sometime the BTC diet for a day if necessary) during that time of the month.
I wouldn't worry about anything being wrong with you... there have been lots of studies that have shown that this is unfortunately *very* typical of women with IBS - there is obviously some hormonal connection there.
On the BC note, I've tried skipping my periods now and then just on the regular dose one (not Seasonelle) for other reasons like vacations, boyfriend in town etc... and for some reason all 3 times I've skipped it I've ended up with an IBS flare-up... Now, admittedly that could be a total coincidence. But maybe my body doesn't like the hormone overload either... Who knows. I know other people on the boards have had success with controlling their periods as a way of preventing these period-related attacks though! HTH!
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Oh yeah!!
) I just usually try to eat really safely (sometime the BTC diet for a day if necessary) during that time of the month. 
