UCLA Academic Update to drop a course?

Im a computer science major and was recently admitted to UCLA. But I am not taking one of the classes I said I would on the UC app (Discrete math), because I couldnt get the class (overcapacity). That class is neither required or recommended for my major by UCLA on assist. org, but is still a computer science class. I have sent them an academic update already but does anyone have a similar experience? I am worried that my acceptance would get revoked.