"plan b really does work , it&#039;s a huge dose of hormones . hospitals use this pill for rape traumas , it&#039;s effective if taken as directed . so take it within the 24-mark. the best advice is don&#039;t stress , don&#039;t surf the web looking for answers , i did and i was miserable for two months . i actually took two of these pills (which i do not suggest unless advised otherwise by a dr or pharmacist) i did because i was worried about me being 170 pounds it wouldn&#039;t work , i bled two weeks later. took tests every week , all negative , took a blood test , negative , i got my period two months later .  it will come , take precautions , don&#039;t worry (easier said than done ) and talk to a healthcare provider on what happened."