im 15 and no period yet

i've got mine when I was 13 but dont worry, sometimes you don't get it until 16 or 17.

if u haven't got periods yet but u have the breast and pubic hair, u shouldnt worry for one more year. but if u still look like a kid, and not like a girl, or u have hair on face like males, go to a doctor.

well do'nt i was 12 when i started and i am now 13 and trust me YOU DO NOT WANT IT IT IS DESCUSTING AND IT IS BLOODY AND STINLY

Everybody gets theirs at different ages. I'd only start to worry if around age eighteen you didn't have it yet.

Are you very thin? I am now 33 and had mine at 9 the first time. Many girls nowadays are too thin to be able to carry a baby to term anymore and also they are poisoning us all in so many ways so it's possible this could be why. http://www.washingtonpost.com/wp-dyn/content/article/2008/11/13/AR2008111303289.html