late period

Melissa
Im so confused. Im almost 2 days late on my period. Took a test and it was a BFN. I know that my period is coming by my cm (usually turns to pink and im like yea AF is here) Well that isnt looking like its happening. My cm is white and slimy (sorry tmi) LMP was Oct 19th. Is it too early to test or just have wait it out for AF to arrive?