If you've been to college and withdrew from a class, did you owe money?

This is my fourth year in college. I have always been really good at classes except for my current class in chemistry. I have tried tutoring, reading the book, doing the extra credit. I just don't think I'm going to pass this class. I have a 4.0. I really don't want it affected. I have a scholarship with the school for 13000. A FAFSA Pell grant for 6000 and FAFSA loans of 12000. If am a full time student right now, will I owe money if I withdraw from this class? Have you done something like this? Did you owe anything? If so, how much?