I too know exactly how you feel. I'm 39 and have been ttc for 9 months now. I know I ovulate every months and my blood results seem to confirm that I am not super fertile, but all is normal. In one hand, I tell myself that at my age, it is normal that it should take that long to get that bfp without anything being wrong and that I just have to be patient. That's the reassuring thinking. But on the other hand, I can't get away from the anxious thinking, feeling that after 9 months of bding at exactly the right time (thanks to the cbfm), how could I not be pg by now unless something is wrong. To make it even more frustrating, we fell pg first cycle ttc when I certainly didn't expect it, ending in m/c a couple of weeks later, so I know we can do it.
I do like wannaB mantra too, thinking that we are getting closer to our bfp each time the witch shows