AF was due to arrive the 18th, and nothing. I'm 5 days late, and test was negative. I'm on cycle day 36.. I've never had more than 35 days between cycles (it's usually between 29-32 days, 35 once in this last year). I don't have any cramps or spotting whatsoever. Not sure if I should wait a couple more days and test again, or make an appointment.