"i took plan-b after having unprotected sex right after my period ended. he got it for me to ease both our minds. within a week of taking the pill, i had some side effects, like headaches and dizziness. after 7 days i received an early period. it was painful, and i had bad cramps. i was worried at first because i had just had my period, but plan-b and you guys reviews all said bleeding and irregular periods were a common system. it really worked! so no worries if this happens to you! i will suggest no intercourse until you get your next period just in case, and a pregnancy test to ease your mind."