Next quarter I'm taking 2 classes. About 8 quarter units. I need 12 to be full time. Would it look bad to grad schools if I'm not a full time student for one quarter?
I don't think a grad school will care. I'm sure there are many former part-time undergrads who went on to graduate studies.
Remember though, if you're on your parents health insurance plan, that the insurance company WILL care and won't let you stay on your parents plan if your not a full-time student.