Hi, i had unprotected sex with my fiance 7 days ago i took postinor-2 7 hours later though i opted to take both pills at once. The last time i used the pill was 2yrs ago and i got periods 4 days later but this time i feel cramps but no bleeding at all, i have been having irregular menstrual cycle and i suspect i may have been ovulating when we had sex. Could i be pregnant? How can i tell the contraceptive worked?