What Causes Pink Color Discharge From The Vagina After Menstruation?

Me and my boyfriedn didnt have sex but i did feel his dick hit my vigina when he was on top of me during our make out. afterwards i felt an orgi... this was 4 days before i was supposed to have my period.... im supposed to b gettign my period tom or saturday may 20-21....n i am having a small amount of pink blood when i wipe...wat is it? n wat does it mean? plz help me im sccared