Glow says it's fertile week but ovulation test day otherwise

Huh? I'm so confused.  According to glow my fertile week starts today but iv been taking ovualtion tests since last Sunday and for some reason they started of very dark indicating ovulation on Sunday and throughout the week they keep getting lighter. I just took a test today and wala not even a slight streak of color.  Did I ovulate right after my period ? What's going on?? ​These were taken from Mon-Wed the darkest being Monday and etc.And this today Thursday.