Ovulation turns into AF?!

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These last two cycles when glow had predicted I’m ovulating I get brown discharge to start off with and light bleeding so I think it’s Ovulation bleeding and then the bleeding gets to a medium which indicates a period to me. Why is my period coming when I ovulate? This cycle will be a 15 day cycle and the bleeding only lasts for 3 days... I took a test on the 6th and got a bfn unless that was too soon. I’m so confused and annoyed. Does anyone have any insight as to what could be going on or has gone through this? TIA