What Causes No Bleeding After Taking Duphaston?

ME & MY HUSBAND HAD SEX JUST RECENTLY BUT LATER FOUND OUT THAT THE CONDOM LEAKED.IMMEDIATELY WE WENT TO OBY AS WE ARE NOT PLANNING TO HAVE A SECOND CHILD YET.SHE GAVE ME DUPHASTON TO TAKE TWICE A DAY FOR 5 DAYS AND ON THE 1ST DAY OF BLEEDING I TAKE THE PILLS.I ALREADY FINISHED TAKING THE MEDICINE,AND I AM NOW ON THE 2ND DAY WAITING FOR THE BLEEDING.I STOPPED TAKING PILLS 7 MONTHS ALREADY,AND IT HAS BEEN 4 MONTHS OF NOT HAVING MY PERIOD.IS IS POSSIBLE THAT I CAN BE PREGNANT?WHAT IF I WILL NOT BLEED?