Have Not Yet Been Contacted to Interview at Duke- Is this Normal??

Hello, so Duke claims that alumni interviews are given on a first come-first served basis and that those who turn in their applications by Dec. 20 receive priority consideration. I really want to interview so I turned in my app on December 1st under the impression that they tried to match applicants to interviewers immediately. However, I still haven’t been contacted. I’m worried because two other people that applied to Duke that live in my area have already been contacted by alumni. One applied on December 25th after the priority date and received notification days later. The other applied December 27th and the same thing, got a call a few days later. Is this something I need to be worried about? I specifically turned it in Dec.1 to have the best chance of interviewing. Does this not bode well for the rest of my application?