Hi My Period Late 5 Days,usually 32 Days My Cycle,last

hi my period late 5 days,usually 32 days my cycle,last period sep 21 2016,i am 32 yrs old.i had unprotected sex oct 20/2016 ,what is the possibiltty is pregnant or last week i had migraine headache 16/10/2016 i am tired,whats the reasons my period late