What Causes Whitish Vaginal Discharge And Abdominal Pain After The Intercourse?

My girlfriend is on birth control and around a week ago we had sex with no condom but i get pull out before the climax. Today we had sex again, but this time i didnt pull out. When she got home, she told me that when she went to the restroom the the egg came out, (the egg stuff) and that it hurt her alot. She saw a little bit of blood come to. What exactly is going on? Please help us