Wow - that must be tough. I honestly think you had an annovulatory cycle and your body doesn't know to start AF on it's own :( I know you want to wait before taking anything to induce AF and that is fine; you won't hurt anything but I think that is eventually what you're going to have to break down and do if you ever want to get back to TTC again. So sorry ((hugs))
I'm assuming you've tested and got a negative? Also, do you temp, and if so, has it shown that you've ovulated? I'd try to rule that out first. If you havent ovulated, your body is still "waiting" and AF wont show. :(
*keeping my fingers crossed you get answers soon!*
2 weeks is a loooong time to wait for AF to show and continue to get BFNs. It does sound like youve had an annovulatory cycle and Michelle is right, you might need meds to get jump-started again, I would call your dr and make an appointment to get checked0out, so that you can begin to move forward, onto a new cycle.
If you have EVER been prescribed Prometrium (even if it was last year), I would call the filling pharmacy and ask for a refill.