After you file

I tried this morning to see my tax filing on the IRS site, My refund tool. It says they have no record of my filing. Its making me very nervous. I have nothing special but just a little money coming back but they have no record of it. I filed on the 4th of Feb. , was accepted on the 11th , I thought they were doing it on the 12th, and within 24 hours it is supposed to show up with the IRS. Where the heck is it ???