period late negative tests

Katie

long story short... I've always been regular on or off birth control pills. I stopped my bc pills and immediately regular 28 day cycles before I got pregnant with my son. I stopped my bc pills 4 months ago and have had regular 26 day cycles until now. my period was due Friday and nothing. I've had on and off cramping since Friday that seems like af cramps but not even a spot of blood. I tested today and the past 3 days all with bfn. I really don't want to test anymore but I'm also confused as to why no af? with my son I got a bfp almost a week before my period was due. I was so anxious to test then so I didn't wait for my period to be late.