Getting lighter?

Selena • Mommy to Jonah 11/07/18 💙 Theo, my angel 10/30/19 💔, and my sweet rainbow, Elliott 4/28/22 🌈

Are the tests supposed to get lighter?

I started taking Letrozole and I got a positive ovulation on CD 16 before I was put on the medicine. Before, it consistently got darker until I got the positive. I'm so worried and confused 🥺

Sorry, I know the pictures are crappy but you get the idea lol.