I'm applying to surgery and I submitted pretty late, on October 10th ( I was overseas in September), I got 2 interview offers on the 11th, and there is still one rec letter missing from my file.
If you're not getting any interviews go back and double check that you've submitted everything correctly, I was checking the document tracker site and realized that a couple of programs hadn't uploaded my PS because I'd forgotten to click the box--stupid things like that. Start there, then think about more major things like did you target realistic programs... and as others have said, depending on the specialty, a lot of the more competitive programs won't be giving interviews until your entire application, including MSPEs are in. By November 1st you should know where you stand