Oh yes it can definitely happen...(I didn't read most of the thread BTW)
This is kind of (really) nasty, but my personal experience was WEIRD.
So when I was 12 I went on a trip to Sedona, Arizona. Went on a trail ride for fun, and because I had experience they threw me on a quick, bouncy horse. Well...You can guess what happened. But up until I was 14 and a half, I had CRAZY hormones. When I was 13/14 I would sweat profusely for absolutely no reason because of it. So when "that" happened, for some reason it wouldn't stop bleeding for a whole week. Freaked me out. It never came back, till half a year later when I got a random week again. Then another half a year later, I got my first "real" period, and it lasted TWO WEEKS. Augh.
BUT as long as you're not me it should be fine. My body just doesn't like being normal, haha.
"The wise man thinks he knows nothing.
The fool thinks he knows everything."