Vanderbilt admissions?!?!?

Hi, I live in southern california, and am awaiting my admission decision from Vanderbilt University in Nashville, Tennessee, which were mailed out wednesday. My mail has come already for Friday the 25th and still nothing. Should I be worried? I heard, USC for example, sent their acceptances priority from USPS so those who were admitted would get their letters sooner. Does this delay mean I have a higher chance of being denied admission??? Please help!!!