please help me out :)

okkk. well I am 15, and I am a virgin so I know it's not normal to have my period that often. I get it maybe every 2-3 months which I heard was normal. anyways, I have been on my period for almost 2 weeks now. normally when I get my period it only lasts about 5 days at the most. I don't know what is going on. is this normal?