Help! New to OPKs

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Hey ladies,

It’s my first month tracking and using opk and I’m a little confused... we’re not trying yet but taking a few months to figure out my body and get on prenatals....my period last month was also 4 days late....according to the app I was to ovulate on CD 15 but looks like I ovulated a lot earlier. Am I doing this right? Welcome to any suggestions!