Quieting The Excitement...UNTIL I Know For Sure!!!

I need HELLLLLLLLLLLLLLLLLLLP!!! I know every females body is completely different and the way one would experience signs and symptoms can be completely different than the next. Although I know this, I'm still trying to get an idea as to what MAY be going on with me. AF is pretty precise as to when she's coming to visit and I can count the day to be exact as to when she'll arrive. The exact pattern is the 26th day of my cycle I'll spot sometime during the day and then nothing else for the rest of the day. The next day (27th), she comes when her luggage ready to stay for a little while. It's been exact for the last 9 months. The last time AF visited was March 4th, in which I should have been expecting her visit March 30th. That day has come and gone, in which I am 2 days about to be 3 days late. As of now there are no signs of AF, only spotting. Because I've been pretty dead on with the timing of when she comes, I took a test after the first missed day...a BFN!!! Although I was trying to psyche myself into NOT getting too excited about it, that BFN got me down. I've gone to numerous sites and they all give signs and symptoms that I'm either experiencing a few here and there or nothing at all.
Can someone give me an idea as to what's going on? PLEASE HELP...