Could I have already ovulated?

Hi all! I’m on CD 9 of my cycle and my ovulation tests just keep getting lighter. Is it possible I already ovulated?

My cycle is typically 26-29 days long, with last month being 26 days. My most recent period ended CD 4 and as you can see in the image I started testing on CD 6. My bbt have all been quite low as well. According to the calendar my ovulation window is supposed to start tomorrow, but that seems highly unlikely. I’m just very confused as my ovulation happened earlier than expected last month and now it has either already happened or is not showing any signs of coming soon. Can any of you provide an guidance or insight on what might be going on? TIA!