So far I have had two programs invite me to interview and one has declined. The places that invited me had a very quick turn-around time from when the applications were due. On the other hand, the program that declined took about a week and a half to get back to me. I am worried because I still haven't heard back from one program whose application deadline was last Friday. Is it too soon for me to be worried that I didn't get an interview? Has anyone else noticed this theme?