I'm 13 years old I got my period at 12 my periods are never 'irregular' but if the are they're only ever early and never ever late. It's 6 days late I've never had sex before or anything like that but my mum is stressing thinking that I'm actually pregnant because I have an 19 year old boyfriend. So anyways the main questions is it normal and why does it happen? is there something I can do to prevent it from happening? I'm jus kinda worried and yeah Pretty much any answers are appreciated thanks;)