Can I ovulated sooner than prediction?

I know everyone is different, but I have a 3 day period and then 4-6 days of spotting. I'm not exactly sure how long after, but that's when I notice more CM than normal. But I almost NEVER have much CM, if any, on my predicted ovulation days. Thoughts?
(I've been trying to conceive for almost 3 years, pretty much given up all hope, but still searching for some and won't give up trying, ever...)

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