this varies from girl to girl, and people keep forgetting that. someone here posted a while ago that a girl automatically stops bleeding when she gets in a bathtub or goes swimming, which is just plain nuts . before i was on the pill, i had a VERY heavy flow and a 7-day period. i took my tampon out before my shower because i wanted to get clean and start all over again, but when i came out of the shower, i'd have blood dripping down my leg already. i don't mean thick blood or anything, it was mixing with the water from my shower, but i sure as hell was bleeding right then - NO window at all. it was only the first few days of my period, though, at least. but now that i'm on the pill, i have what i consider to be a very light flow and a 5-6 day period, and i'm usually only bleeding when i come out of the shower on my first day. if other girls don't bleed at all when they come out of the shower, then i can't imagine what kind of light flow they must have... must be nice .