Ovia and Period tracker say I'm late

Six days ago I had a case of scary gas. Five days ago I spotted pink, but no bleeding. For the past week, my four year old son has been driving me crazier then usual. My other <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> say I'm two days late.  Glow has always been wrong with my start dates.  I'm wondering if anyone else has had wrong dates with glow?