My Projected Period As Per My Period Tracker Calendar Is

My projected period as per my period tracker calendar is on OCT 18. I am 5days delayed now. I just want to know if do i really need to be scared because is it possible that im pregnant or its just my stress that is causing my menstruation to be delayed? My last intimate was oct 18 (protected/we used condoms). May last period last sept is sept 8.