If it was mailed October 1st/2nd then I'm thinking it should arrive soon now right? Or should I be worried?
Given that you have 9 days in which to get the documents, verify that they're complete/accurate, and send things off to the expediter/consulate...yes, you're on a bit of a deadline and should be concerned.
That said, there's no way people on an internet forum can help you with this, unless someone happens to be a postal employee AND can magically find out your tracking number for you and update you on the status of your mail.
If you feel you must do something, try calling various post offices (US & UK) to see if they can give you any info. From my encounters with the USPS here, though, I doubt you'll have much luck (and that's without postal strikes).