March 29, 2009 7:38pm CST
Do you have anything that tells you that your period is coming? When I was younger, I noticed that I suffered from diarrhea a day before I got my period. That stopped after a couple of years and now I know that I'd be getting my period when I start feeling acidic and I get a headache at the same time. Of course this also sounds like I'm just hungry...but not quite. I guess girls just know the difference.