dont sweat it man.
I usually never ever ever enroll during pre-registration.
I either wait till regular registration time, or I’ll pop my head into the assistant deans office. Going over the heads of the advisors will ensure you get your classes. My advisors hate me, because whenever they give me a no answer, I just go over to their boss (assistant dean), and he works his magic. The key is not taking no for an answer. We spend way to much money to get rejected from courses.