"i had unprotected sex the night of the day i apparently was ovulating (didn&rsquo;t &ldquo;know&rdquo;, didn&rsquo;t check my period calendar. the period calendar is pretty accurate with keeping track). i took plan b within 10-12 hours (the next morning). my period was expected to come 2 weeks from that day, and i got my period 3 days before it was expected to come. plan b is definitely something i would recommend if you are worried about getting pregnant"