Ovulation test help!

Giselle

I’m pretty sure my ovulation tests are getting darker but I’m new to reading them. I’m supposed to be 8/9 dpo according to my apps. I only did these for fun while testing for pregnancy (all pregnancy tests have been negative but it is still early). Can someone tell me if they are getting darker and why that is even if I already ovulated? Thanks girlies ❤️❤️