HELP ! TMI PIC

My period was due today, according to FF app, Kindara and Ovia. But Glow says my period is due August 4. My period is always 28 days. I wasn't able to do opks this month but I charted my bbt since after my period stopped. Glow says I ovulated on July 22 but all my other apps say the 17. Can someone help me figure out when I ovulated and if I should test or not? I am also have a lot of this CM in the pic