http://www.plannedparenthood.org/health-topics/pregnancy/how-pregnancy-happens-4252.htm
I'm 13 yrs old and never had sex but I really want to. But I just looked up your answer and ...... YES you should worry!!!!! Good luck and all. :)
ur 13 and u wanna have sex? I can understand that, but plz don't do anything stupid. at least wait until ur halfway through hs, or even are in hs
If your period has started, you probably have nothing to worry about.