Positive ovulation test strip

I’m new to testing and noticed this morning it said I was at my peak. A couple of hours later I tested again and now it’s reading low. Is this normal? Why did it change so quick back to low? When am I suppose to be BD? Did I already miss my mark. Any info would help as I am new to this. Also checked my bbt and it dropped this morning as well if that helps. Thank you!

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