AF Late neg hpt

My AF is 1 day late. My periods usually start on the same day as my calendar each month. I took a FR hpt and got a neg. When i took the test i could have sworn i saw a faint 2nd line as the test was starting then it went away and left the neg line. I have never had that happen before. Also what makes this so strange is I usually get symptoms of my period about to come but this month i dont feel like it is going to come. what should I do? when should I test again?? I seriously need someones advice. im sorry for rambling Im getting anxious.