Ok so my period was supposed to start on Sunday and instead of my usual somewhat heavy flow all that happened was a little brown-light pink spotting. It's now Wednesday and AF still hasn't appeared. Still light spotting but not even enough to wear a pad or tampon. Took a test just to be sure but it came back a BFN. Is this normal or should I be worried that something is wrong with me? This just isn't my normal cycle behavior at all