My period was due yesterday. I am a cervix and cm checker so of course I did so. My cm went from creamy/watery to cm with a tinge of brown/pinkish to cm that was yellowish only when I check my cervix (I never actually spotted). I went to sleep for sure that my period would be here in the morning because before it when it yellow I seen a tinge of red when I check my cervix (once again never actually spotted). I just woke up and seen nothing on my tampon again. I checked my  cervix back to creamy/watery with a hint of yellow. My period has not been in late in 4 cycles. Any similar situations? I plan on testing tonight or tomorow if it does not come