Masterbate In Russian What Happens Before Your Period?

What happens before your period? - masterbate in russian

I am 14 and havent started my period yet, but all my other friends. ahh! curous but I was, what could happen if you masterbate, have sex, or too much water into the stomach before you start? I do not know know how to get water there, but you never know. Could one of the things that you prevent your period or pregnant?