Closer to ovulation?

So this is my first time tracking my bbt and taking ovulation tests.

Glow says that my fertile window is from the 24-30 with ovulation being the 29th. I know it’s just a prediction.

I have been taking ovulation tests all week and I feel like it’s just not getting darker with the predicted ovulation so close.

I am also just getting off a non hormonal iud. I was on it since January of 2021 and just got it out middle of November. I started by period 3 days later after not having one for two years and it lasted 7 days.

Could the tests not be getting darker because my body has to regulate again or am I just thinking I’m not seeing them get darker?