Hey atleast wait for two or three days.
After that check the zonal website of IIT to which u had sent the form.Sometimes they receieved it early but they show it late on the website.
Mine form too was shown 'received' after three days by IIT-d on website.
So don't be impatient.
Check it atleast after two-three days.I am sure they will receieved it by then & will show it on the website.