A childhood belief about periods

I didnt find out about periods untill I was TEN. My friends Mum explained it, not MY parents. Anyway after the talk, me and my friend went back to my house & she said to my Dad 'My Mums just told us about periods, where blood comes out instead of wee'
In my last year of primary school aged 11, I overheard my teacher talking about a girl in my class who had already started her periods.
I thought that you would be stuck on the loo for HOURS because loads of blood would come out for hours on end, and because of the talk with my friends Mum, I thought that you would be stuck on the toilet peeing blood for HOURS, so I was rather confused as to why that same girl who had already started hers, was in her chair doing work and not peeing blood oin the toilet until 3pm. lol