"so i promised myself that i would write a review after my experience taking plan b for those of you who are worried just like i was. the incident happened 5/27 which is 2 days away from my period, meaning i have already ovulated. me and my bf were having unprotected sex, since i was on top of him i&#039;m the one who is in control to pull out or get off his thing. he told me that he was about to ejaculate but i didn&#039;t get off too quickly so a couple drops of his cum came in me. after 9 hours from the incident i took plan b at night and it made my period late for 4 days which is not bad. i have read that other girls even get their period late until 2 weeks and even for 20 days late!!! so just hold on tight and don&#039;t stress about it."