What Causes Vaginal Spotting Post Intercourse?

Ok My Name Is Jasmine Leshea And Me And My Boyfriend Have Been Sexual Active And I Notice After We Have Sex I Notice That When I Use The Bathroom And I Wipe I See A Streak Of Pink Blood Its Only A Little And Only When I Wipe And Then Just One Big Clot Of Blood Came Out Could I Be Pregnant Cause I Have Gotten My Period Yet And I Usually Get It Every Month On The 9th On Time Could I Be Pregnant , I Hope So .