Missed/late period but negative pregnancy test I've been taking yaz birth control for over a year until December of last year. I stopped because I noticed that it was contributing to my anxiety. Last month I tracked my period and it came on day 29. However, I'm very worried because I'm currently on day 34 and it hasn't come yet. I am sexually active and I have since switched my birth control to condoms and the calendar method. What could be the cause of my late period?