"for those are you who are scared or anxious about the plan b pill, i just wanted to reassure you from personal experience that it works, and isn&#039;t necessarily full of side effects either. i took plan b and the only side effect i felt was a little bit of moodiness for a couple of days- otherwise, no physical side effects at all. also, my period came exactly on time and didn&#039;t feel any different than my past periods! 

however, i would advise that you definitely should take it within 24 hours, if you can. although it says 72 hours, the pill mainly works to prevent ovulation- if you wait too long to take it, you may risk ovulating before you take it, lessening the main effectiveness of the pill."