Adjustment of Status - I-485

I applied for i130 and i485 on August, 2014, then my case was pending for almost 5 months because I didnt have a qualify affidavit of support,so my i485 was denied, last year 2015 on September I had an interview where my i130 was approved, October 2015 I apply for i485 again since I got an affidavit, I did my fingerprint and everything, since November 27th 2015 my case status said Ready for an interview to be schedule, I got my EAD sent on January 2016, but on April 27th is 5 months since it says Ready to be schedule, is it normal??? And what should I expect on thay interview??? Can someone help me !!