I've always been pretty irregular with my periods, even now I'm 16 days late and no, I'm not pregnant. There's times where I'll be  a month or even 3 months late. I've always thought it had to be stress related (I have a panic disorder) but now I'm worried that it may mean I have fertility issues...anyone have experience with this? And do I just go to the ob/gyn to get tested or can planned parenthood help?