So I have three app to track my cycles and well I'm so confused as two of them say I'm due around 21-23 and ovulated around 4-8 and the glow said I'm due in two days I've got my setting set as what glow say at top but should I be going by what Ive circle on pic.

I defo ovulated around 4-8 as I check everything so I am postive about that it my period I'm worried about. Also on all my app I have setting to avg cycle 40 so I don't know what to go by.

Am I every 35 days or 40 days????

Other apps say this but setting are to 40 avg cycle.