" As part of our Early Decision program, you are committed to accepting our offer of admission. You must withdraw any active applications you have to other colleges/universities. The only instance in which a student can request to be released from our Early Decision binding contract is if the applicant’s financial need cannot be met, which would be determined only after consulting with Penn’s Student Financial Services."
Have other applications ready as a backup in case you are not accepted.
http://www.admissions.upenn.edu/apply/freshman-admission/early-and-regular-decision
Did you take the SAT? What were your scores? How about subject tests?