Hey. On Approx 20-22 Jan I Had Sex Without Condom

Hey. on approx 20-22 jan i had sex without condom although my partner was not sure that the sperms was discharge or not, so i took unwanted 72. i am not getting any bleeding now and my last periods date was 28 dec. I took home test on 31 jan but it was negative. please help me to know what is happening? is there any chance of pregnancy . and what if we take unwanted 72 if there is no sperms discharge.