"i&#039;m 18 years old. completely afraid after having unprotected sex, i took plan b about 27 hours later. there was no ejaculation inside, but the risk still runs with pre-ejaculation. only a couple days late, i started my period. i had no side effects at all from taking plan b, but i did make sure to have it with food. ladies, i&#039;m not sure if it worked for me, or if i was even at risk of getting pregnant, but take the necessary precautions. the stress, the fear, the unpreparedness, it isn&#039;t worth it. always keep it safe from stds with protection, anyhow. plan b is a back up plan, use birth control and a condom! good luck and relax! stress can delay your period! &lt;3"