Glow Legend???

How does the <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> know i'm not pregnant? i marked down all of my information and after logging my information the past few days, it informed me that i'm not pregnant on the log. I haven't taken a test or anything and the last time i had sex was sunday (also on the log). is this just an example that's on the app for everyone?