Driving myself nuts

So no AF yet, and my temps have remained steady.  I still feel very much like AF is coming any minute, and I have had very light pink spotting on and off since yesterday.  I really wish my temperature would have dropped already today, because tomorrow is my birthday, and I wanted to already be sure I wasn't pregnant by then.  The not knowing kills me.  I am not a patient person as it is, and this waiting is torture.  I am 99% sure I am not pregnant, but that 1% uncertainty is enough to drive me crazy.
I've decided that if my temp goes up tomorrow morning, I will test, and if it goes down then assume AF is coming.  If it stays exactly the same, I have no idea what I will do.  Probably test anyway and then kick myself when it is negative.