Inducing periods

[simplebeauties.livejournal.com]

Hello. I am on OTC-Lo and I'm in my period week. My period usually starts on Wednesday [It lasts 4 days] and ends on Saturday.. Right before I start my new pack. I was nervous because my period didn't start today so I induced it with a masturbation session. It worked. My question is, had I not done that.. and it took let's say a day longer to come... Would I just have like a day long period or would it spill over to my first set of pills with the next pack?

Also... Why does your period stop in water?

Thanks.. [=