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I have already applied to my schools and am probably just stressing now, but I have a question regarding the section many applications have about a disruption in your undergraduate education (can't remember the exact wording). I am graduating a semester early, would that be a disruption I should have disclosed? If so, would it be worth emailing or calling the schools just to let them know?

They only care about interruptions in your studies between beginning and completion. No need to worry.