On nuva ring, took plan b a week and 3 days ago & period is 1 day late. currently have yeast infection, cramps and yellow discharge, what is happening?

Doctor can evaluate: Plan B can alter the menstrual 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. A primary care or Ob-Gyn doctor can evaluate to see why the other vaginal symptoms are happening, and check for infections.