Probably nothing to do for now, just wait.
In my parent's case, after 3 months of waiting we got a confirmation email for my mom's application but not for my dad's so I was wondering why. Then in a week my dad's application was returned in the mail unfortunately
- all because we accidentally forgot to put application date on the last page under the signature :-(
So, I had to resend it and it went back into the queue:-( So disappointing - I wish they could have checked for those basic issues right away, not after 3 months of waiting in the queue
Really hope it is not your scenario but thought I'd share just in case (for some people it was about pictures being not up to standard etc)