Yes, you can have a PP AF with no ovulation. I usually start charting again once I get my first PP AF to see if I am ovulating as well. My temps are all over the place so I know that I am not ovulating. When I start ovulating, my temps normalize and fall into a pattern. AF does not guarantee that you are fertile but it is a good sign. Sometimes things get tricky and it is hard to tell whether or not you are ovulating with during cycles, which is why I am expecting #4 in December.