I received an email confirmation from the LA consulate the same day mine was delieverd. However I used FedEx and it had to be signed for and this was back in March.
From what I've been reading across the boards, some are receiving confirmation emails, some are receiving phone calls and some don't receive anything till they have the visa in their hands!
I would go on the basis of 'no news is good news' and try not to worry about it. I know how hard that is not to do but do try to relax.
Best wishes