Okay, I'm 17 and I had my last period on November 9th, 2006and since then it hasn't come back. I'm definitely not pregnant because I'm not sexually active. I finally got an appointment with my doctor about it since he's really busy. However, after waiting for over an hour at his office for him while he was with other patients, I got frustrated and left because I had a test during my next class that started in twenty minutes. Since then I've tried to book another appointment but he is ridiculously busy. Anyone know what could be wrong? BTW, prior to this my period was always regular. TIA!