What Causes Prolonged Pinkish Vaginal Discharge After Having Intercourse?

I started on the 19th and that night me and my boyfriend had sex and than the two days after that it was normal well on the fourth and 5th day it looked as if there was some light pink discharge which has never happened to me? What could this be? - And than I stopped and I felt like shit and had a fever - And I never in my life had that light pink discharge like I did