Hi. Please Do Help Me. My Boyfriend And I Had

Hi. Please do help me. My boyfriend and i had unprotected sex last Sept 3 at around 11am, my supposed to-be menstruation was Sept. 7, but then during our sex i had bleeding thinking it was already mens so the cum came inside me because we knew it was safe if it was a menstruation. I took nordette within 24 hrs at exact 9:11. Took 4 then 4 again after 12 hours. I still haven't gotten my period. My last day of supposed to-be period was yesterday (am i right?) am i just delayed or already pregnant? please do help me so. We still can't make a baby. :(