Oh thats useful - to have a known pre-ov-dip!
One month I gave up drinking cola and my temp rise was slow and steady! lol, I have no idea if that was a fluke or because of the lack of caffiene in the cola! The thing I like most about charting is that I can tell the day AF is coming by a temp drop that morning - but even then I have been caught out once or twice when it was only a slight drop.
Oh well! I guess you really CAN'T tell your pregnant until that BFP no matter how well you study your charts!
Jo xxx