Pink discharge after period

Hey guys, so this morning ( Tuesday 11/28) I went to the bathroom and wiped and noticed pink discharge, which is very odd to me granted that my period ended on Saturday (11/25). I had unprotected sex right before my period on the Tuesday right before my period (11/21) and right after on Sunday (11/26), however I am also on the pill but was on the sugar pill that previous week. Any suggestions/explanations for the pink discharge? Could it just be leftover blood from my period or from rough sex that occurred on Sunday night?