This is confusing. Can someone help please

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Ok so I know when you get a positive O test it's because you're going to ovulate after the positive. I got it last night on CD9 but my BBT chart shows I haven't yet.

It's because the BBT is to say the day you release the egg right?? I'm new to all this bbt testing.

This was taken last night at 8pm. I didn't even realize it was positive until just now 🤦🏼‍♀️