I had sex 9 days ago and used the pull out method, but it was very close. I took plan B 6 hours after and felt the normal immediate side effects. I was about at the end of my cycle ( I got it the 24th last month and had sex the 23rd) and I figured I'd be fine. Today after 9 days I got a very light brown and red discharge, like just very light spotting that I usually get after my period. Could it be implantation or was my cycle reset by the plan b?