We've been through 3 and a bit years of trying with male infertility, had a couple of chemicals. I'm currently 14 days late on my regular as clockwork 26 day cycle. I'm so late now that my NEXT period is looming. I cannot get more than a ghost of a faint line, looks like an evao but comes up immediately. Both my boy pregnancies took weeks to get a bfp so I have form for this. 
I just took another pound land test, was looking the same as usual, nothing much happening, then all of a sudden at the 4/5 min mark a whole new swathe of pink dye runs across the finished test and makes a positive line. What on earth? Am I supposed to get excited? Who knows! 