I've had 2 cycles of 18 days when I'm usually 27 days. Now I'm on CD 25, and drumming my fingers impatiently on the table thinking SOMETHING must be coming soon! Its driving me potty because experience tells me to be patient and wait until I'm well past the 27 day mark to test if my AF doesn't arrive...but the damn 2 18 day cycles are throwing me!! ARGHH!! Do I make sense??!