What is up with my period

I've just gotten my first period (whoop!) but it's been extremely irregular. My first two days were light, before it suddenly became extremely heavy, I would completely soak through a super tampon in a little over an hour. My cramps were terrible and I was forced to miss school because I physically couldn't move without being in agonising pain. I'm on the 8th day now but had seemingly stopped before starting up again on the fifth day. Is this normal or should I see someone about it?