Don't worry, long posts are fine! It sounds like you're in a confusing spot!
I think wait it out a few more days, and see if AF arrives or test again. Some people don't get positive results from a preg test for a little whilte after AF is due, so you never know, this could all be a good thing.
If AF arrives (or doesn't, and the test is negative) I'd head back to the Dr. If yours isn't very understanding, get another one. They are out there - mine was absolutely lovely when we found we were having problems.
Have you tried temping? I know it sounds like a bitof a hassle, but I think it would be great in your situation. It might be that your body just doesn't like regularity, and ovs at odd times. If you were temping, you'd probably know when you'd oved, and so would know when to expect AF (or hope she doesn't arrive

). There's a thread on this board with the details, and another where a lot of ladies who temp hang out (they're lovely)
Also, when they did the tests, did they check to see if you were ovulating? I'm sure they did, since it sounds like they were thorough, and it would have ben a problem if you weren't.
Hang in there - I'm sure you'll get through. This kind of trouble is never fun, but you'll appreciate your Bubs all that much more when you have him/her.