Well DH and I have been TTC since July. And although that's not a long time at all, I've been having extremely long cycles. My AF is normal (lasting roughly 5 days), but the time before my next AF kept getting longer and longer and now I am currently 75 days since the start of my last AF. I decided that I would call my regular doctor for an appointment because well, let's face it, if you aren't ovulating or ovulating regularly, it's pretty darn hard to get pregnant. At first I was nervous about going to the doctor because we haven't been at this very long and I was coming off of BC (ended in May), but when I called for the appointment they were very glad that I'd take the step forward. My doctor explained that although she can not label us as "infertile" right now because it's not been a year (you have to be labled as infertile to be seen by a RE), she COULD start treating me for my irregular cycles (and that includes some of the less aggressive treatments for fertility issues).
So all in all, I'm VERY glad that I took the step forward and called my doctor. Because now I'm on a path to pregnancy a whole lot sooner than if I'd waited.