Is this normal for ovulation?

McKayla • Mommy to a 5year old , a 3 year old 🌈, and 1 1/2 year old 🌈🌈 Wife❤️💍 mommy to 4 angel babies! 👶🏻🍼👣 Due 5/02/24👣🍼👶🏻

I’ve taken 3 ovulation tests. My ovulation day is in 3 days. The one I took yesterday seems to be darker than the one I took today. What does that mean?