Took plan b one step march 20 got my period 5 days early on march 30 thought it ended april 5 now im having light bleeding. is it because of plan b?

About Plan B...: Plan B can alter the menstrual vaginal bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time, but not all the time. If vaginal bleeding symptoms become persistent or worrisome, a visit to one's Ob-Gyn or primary care doctor may be needed.