How long can plan B delay period ?I took Plab B 12 days ago , 22 hours after an incident in which there was no penetration but I wasn t certain that any Sperm didn t contact my vagina . My period was supposed to start anytime betwee one day to one week after I took plan B . Last week after taking the Plan B I felt fatigue, nausea and upper abdominal pain , all of which have now subsided. For the past two days I ve felt my usual PMS symptoms ( mood swings anxiety , uterine cramps )I m worried because my period still hasn t come . I ve been really stressed out , lacking sleep / staying up late due to anxiety and stress from school . I took a pregnancy test two days ago and it was negative . Are my symptoms consistent with plan b side effects or are they early pregnancy symptoms ?