Feeling Low.... BFN :(

Sorry but I need to vent.. How can we be able to get the exact timing of O and BD right and it still not work :( I'm feeling like there is something wrong with us... Glow tells me I can test Tuesday but I couldn't help myself.. 
BFN :(  and now my CM is drying up- everything is pointing to AF visiting.... Timing could not have been more perfect and still nothing- Why, why, why?? :(