Agree, talk to counselor. Most important, if you are a senior who has already applied, is informing the colleges of the change because it is often the failure to inform colleges of changes that can be the cause of reconsideration of admission rather than the actual changes. UC’s require you to report any changes to your senior year schedule: http://admission.universityofcalifornia.edu/how-to-apply/after-you-apply/index.html