I never know when my period comes

Eileen
My period should be here in a few days but that's only because I took my ring out so I know it should be here soon. But I have a feeling it's gonna be messed up. Anyone else feel like this after having a baby? I also had to take plan b last month. Even with a <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> it's always messed up.