My boyfriend and I have always practiced protected sex. Last month around August 29th, just about 3 days after my period ended, he stuck it inside me and took it out IMMEDIATELY. (he was not wearing a condom). Now this month I am just about 3 days late and I am petrified. Could I have really gotten pregnant from that? I have also been going through a lot of hard times (Parents are going through some things, stress from school, boyfriend is stressing me out too). Can that affect my period, too?