my friend
It could be many reasons , i am gona share few
Did you sent sufficient funds ?
Did you sent your application before your time ?
Did you make a major mistake on your application ( you should have copies , so you can check them out)
I know it must hurt going to that mailbox , or keep checking your bank to see if it was cashed or not ...
Just wait , a little longer and you should be okay ... if worst happends you just reaply .. just see what the holdup is ... they should send you somethin back in case you dont get anythin back in 30 days just re-apply
p.s. this is what i would do but ...