Should i be worried?

I had my skyla put in on 4/26/16. My periods were like clockwork the first few months. The passed few periods have been off by a few days (both early and late). This time my period is almost 2 weeks late. Before I had the IUD put in I had irregular periods because I have PCOS. I heard that this one can lighten or get rid of periods so maybe I have nothing to worry about. I have been severely depressed lately (I have depression but it normally gets super bad around when I get my period) and I've been really really irritable.