I think that lots of programs have started interviewing. I know for a fact that SA, UW, VCU, OSU, OHSU, USC, Tenn., UConn, UIC have interviewed already. Some of these programs may or may not interview additional applicants; some programs have already filled their class. I think Maryland is probably done interviewing by now as well. If you don't hear anything in 2 weeks from now, I would be worried and start calling programs to see if they have any spots as some initial acceptances may have dropped out which would potentially open up space for someone else. Good luck!