Unprecedented sex and contraceptive pills

Patient: Hello I am 28 years unmarried female. I had sex with my fiance on 6th & 8th July without protection and had unwanted 72 on 8th n again had sex on 9th July n beocz of condom failure I took unwanted 72 again on 10th July. What are the chances of getting pregnant or failure of medicine. I got my last period on 29th June,2014 n m 80kg with 5’4 hight. Please let me know m in tension as we are getting marry in December as he has to go back to USA