super late for period

So I'm literally 30 days late as of today, I took a test literally my first day of being late(mainly because I don't want any children, now or ever & if I was I wanted to catch it early) well I tested again almost 2 and a half weeks ago or so and they have all came back negative. I have never been late before. The <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> app has always been spot on, I'm kind of freaking. Opinions?