I took postinor 2 doses twice in four days.. i took the first dose on the day my bleeding ended.. will i prevent pregnancy and would i have ovulated ?

Twice?: Plan B, Postinor 2, and other brands of emergency contraceptive pills can alter the menstrual cycle for the cycle in which Plan B or Postinor 2 was taken, and sometimes the next month's cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex, because emergency contraceptive pills work most of the time, but not all the time.