12 days late and Eve tells me i have a 7% chance of pregnancy...

Shannon

So, how can i have a 7% chance of pregnancy if i am 12 days late for my period?

I mean <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> isn't taking into account all my other symptoms.. But how could that make sense? 7%, really??