Maybe I should start with the fact that I have not been sexually active since January 2012 so I can't be pregnant. I haven't had my period for some time now. My last one was in mid-September. I have been researching and found that it is sometimes normal for people my age (19) to have irregular periods but it has been almost 4 months! o.O So now I am getting quite worried, should I just wait it out? Is it about time I see a doctor?