Tracking ovulation...opk or cm tracking?

My husband and I recently deceived to ttc. I’m 22, healthy, with an extremely regular period. Like spot on every single month. I’ve been tracking cm and I’m pretty positive when I ovulate...but I want to up the odds. Should I keep doing what I’m doing? Or invest in some OPK’s? The only thing stopping me is seeing so many people taking the OPK’s and still unsure if they’re ovulating or not.

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