"i took plan b within 24 hours after unprotected sex. a few weeks later i got side effects that i figured were from the pill, but they were similar to pregnancy symptoms as well. i didn&rsquo;t stress about it much, then when my period was late i figured it was another side effect. 10 days of my period being iate and  finally took a test, positive. i got pregnant even though i took plan b within the 24 hour span. maybe i was ovulating too closely. i think this medication does not work if you&rsquo;re ovulating or about to ovulate. keep that in mind."