Call them and ask to re-send until you received it. No worries, I have the same issue three times. I called them, they said that sent it to me but I did not receive nothing.
Just call and ask, this is al what you can do
At least you can be calm because all is good with your application.
The only reason is a high volume of applications.
So try to relax and go to gym, read books and drink wine. This only what you can do to switch your brains from exhausting waiting.