If you still don't get a code after 10-15 minutes (the automated process can take a surprisingly long time), go to the support system and create a ticket referencing this thread requesting your registration code and we will manually send it to you at that time.
Did you pay by paypal too? They have to be processed manually, but you should get your code pretty soon. Is the receipt you got from paypal, or PAH? I'm sure your order won't be lost, but if you create a ticket on the Support system we can chase it.