Ive had unprotected sex, he did not cum in me but i wanted to be safe and took a plan b a day later my discharge changed about a week later. now its a brown color and has a scent what could this possibly mean ?

Some thoughts...: 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. If there is an unusual, new vaginal discharge, one's doctor can check for the cause, which could be an infection.