I thought I had been rejected from Michigan because I didn't get an interview and saw other people did, but I got accepted anyway. On the other hand, I had an interview with UCSD, and they were just clarifying some things and making sure I was really interested in the program. I guess they have different reasons for interviewing people, so don't assume it's a rejection.
This whole process is so complicated that we can't be sure of anything, so just keep your head up and good luck!