"ladies plan b does work! i had sex with my boyfriend on november 1. so got plan b two hours later. i only had mild cramps. my period was suppose to be on november 18. i was two weeks late. so i took a pregnancy test. it was negative. i knew i was going to miss my period because i was taking my finals and was stressed out of mind. i waited for my next period andi i only had brown discharge and very small spotting. i continued to wait and decided to take a blood test. the results showed 0 hcg and stated not pregnant. i knew i wasn&#039;t pregnant the whole time, because i didn&#039;t &quot;feel pregnant&quot; and i continue to experience my period symptom which include acne. and finally i had my period. be patient!! i waited two months for mine."