What Causes Foul Smelling Vaginal Discharge And Cervix Erosion?

Hello, I am 36 yrs female, having two children son 9 yrs and daughter 3 yrs both C Section babies, I had a vaginal discharge yesterday evening blood and some fluid which was foul smelling, saw the doctor today, the doctor did a PAP smear test and tomorrow will be doing my sonography tomorrow, doctor says that my cervix looks eroded, iam scared to even think of cervix cancer or any infection..pls respond