My return was ACCEPTED but visited IRS return status website. Says hasn't been RECEIVED. Says give minimum 24hrs, it's been 3 days, why? Should I be worried??

Federal return was ACCEPTED not even 1hr after electronically filed.  IRS return status website says to wait at least 24hrs, its been 3 days? My main concern is should I be worried at all? Is there anything I can do to fix it or speed process up?