Not sure why you have not been called for interview yet, my neighbor and I applied on the same day, both were not required to show up for fingerprints, and also we got interview on the same day. I hope you get your interview soon. Also, we both applied based on 5 year general provision (5 years residence). Only difference is she came to USA in 2001 on a tourist visa and got married here, and I did in 2009 as a family based (spouse of a USA citizen, but never applied for citizenship).