Ovulation question

Hubby and I are ttc. The <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation tracker</a> says my most fertile time was Wednesday. But my CM now looks more like the ovulation CM that everyone is talking about. Could my ovulation just be messed up? My period timing is off every month by a couple of days every month too. Help....