What Causes Vaginal Discharge Post Intake Of Morning After Pill?

Hi I m really worried I finished my period two weeks ago I was sexually active after I finished my periods and I took a morning after pill straight after then two days ago I was sexually active but didn t take a morning after pill since he didn t penetrate inside me and today I ve been spitting blood I m worried I may be pregnant do you know I ve been spitting and I have back pain and some cramps