Hi...i Have Sex With My Bf On 13/9 Which Is

hi...i have sex with my bf on 13/9 which is the day i ovulated. Then i took postinor 2 the next day within 24 hrs. On 22/9 we had another sex again but i didnt take any pills bcz i supposed have my period on 27/9...but up until now there is no sign of my period will come.am i pregnant? pls advice