Period late!! Pill missed !!

So I had unprotected sex and missed my birth control on the 5th . I took it that morning on the 6th and took another pill that evening that SAME day (6th).....now my period is one day late and I have seen no signs of blood. However I took a pregnancy test on October 15th, Nd it said Not pregnant.

My question is why my period is late ? Am I pregnant?