Fiance Visa - K1/ K2/ K3/ K4

To add my name to this list, we filed in Oct. 2015 and got NOA1 stamped on 28th. Not heard about NOA2 yet. Website shows no update. I tried to call but they got no info for me. The thing bothering me is that people my fiancee know, filed after us and they have NOA2s, and even interviews planned for January 2016. One person even filed a day after me. How these people, if the service offices do them in order of being received, are ahead of us? So this is my experience... stressful in waiting. What scares me is being denied for something because I am not perfect (no, no jail, drugs, owing $10000 to taxes [but school loans another matter]). So what is it? How a few other couples filed after me but got their NOA2s? We are on a time limit here but there seems to be nothing I can do.