Nuvaring user question :)

I have been using Nuvaring for several years and decided to take a bit of a break from birth control for my body's sake. I've been using birth control since I was 17 and just turned 28. My last period started Feb-13 and here I am on Mar-14 and my period hasn't started yet. The app here is telling me it should start today and it's only the second month I've been off BC. I had protected sex once after may Feb period ended so I'm not really concerned about pregnancy but I feel like my period should've started by now. Any thoughts?