I took plan b 4 hrs later after sex. A week later as in this past Thursday i started to have an alike period & for the last 3 days or so I've been having nothing but "brown" blood. Im on cycle day 42 which i started to bleed around my AF due dates. Now im not sure if that was a side effect of the plan b or if it was my actual period. I don't feel pregnant & im not sure how plan b exactly works but I've had to use like 2 or so pads a day. If you're more informed on this i would gladly like to know.