I had unprotected sex but my boyfriend did not ejaculate or even come close to it. I was on day 9 or 10 of my cycle when we had sex and I took the Plan B pill 60 something hours after sex. About a week and a day after taking it, I have been experiencing light brown discharge when I wipe and occasional light cramping. Is this a sign of implantaion or a side effect of the Plan B?