ovulation confusion

Eve
Ovulation confusion!! Please help!
Hi everyone,
I tested clear blue digital ovulation sticks yesterday which I think was later than it should have been to test. It came up low fertility. Today I tested and it is telling me I am high fertility. Glow had been saying I wasn't due to start ovulating until next week but now has changed. I am so confused!! Did I start testing too late or is it correct??