Hi,
What was the end result for you? I'm in the same boat right now and just waiting to see if AF will show by 11/30. I dont usually O on my own except this month my P4 level was taken and confirmed that i did O this month but i wouldn't have know if my RE didn't check my P4 level.
Sounds like you have pretty good odds in your favor!! :) The very early pregnancy signs can often be confused with cycle symptoms, but in my opinion, if they last longer or are more intense than you normally feel them or would expect them to be then there is an even better chance you are pregnant! Being only a few days PO though, I think the symptoms you are having are cycle related. But if they don't go away, and af doesn't show... Then take a test and let us know!! Good luck you you!!! :)