I started my period last oct 13th and i had sex with my boyfriend on oct 15th. my period the day after was became spotty. ?

Im not sure i get ?: Is there a question here, I have to assume that you are wondering if there is any connection to the fact that your period became spotty. Not knowing all the facts makes this a difficult ? To answer. I would have asked how long your period is normally and how heavy it usually is. I don't believe that you have anything to worry about, however since your period had already begun.