"i was on antibiotics &amp; taking birth control pills, of course when taking some antibiotics it cancels out your birth control. to make a long story short, me &amp; my boyfriend had unprotected sex &amp; felt like the plan b pill would be the best choice of action. i took the pill about 12 hours later, the only big side effect i had was my period lasted for 22 long days! did the pill work? yes. would i recommend it? yes, just be ready for the side effects. i&#039;ll take being on my period for 22 days over being pregnant any day!"