What Causes Blood Vaginal Discharge After Sex?

Hi my name is Rachita....actually i was too close to my bf yestrday but i didnt had sex exactly,actually just 5% of his dick was inside my vagina dats all...but after sumtime wen i was back home i saw blood cuming out of my vagina I thought i got periods but later on wen i checked there was no more blodd wat does it mean exactly m scared.??? Will be I pregnant by this in future??