Hi I'm a little new at this. I've had my period since I was around 11-12 and to be honest I didn't start "tracking" it till about a year or so, I'm 17 now. I am conserned that something is wrong. Usually, although I could be wrong, I have 33-35 days before my next period but it's been over 57. I haven't had sex but still I find this odd. Any opinions on what could cause this?