How To Prevent Pregnancy After Having Sex?

Hello Sir, Me & my wife had sex with condom but in between inter-course the condom has been fail and sperm in-side vagina on dated 01/March/2014 time approx 22:45, last period date is 10/Feb/2014 lasted 15/Feb/2014 kindly suggest can she use i-Pill or Unwanted 72 for no pregnancy pls suggest .