Why are my LH tests staying dark?

Emma • Married 22 y/o TTC baby #1 ❤️ April 2020 👼🏼 May 2020 👼🏼 TTC 12+ months Cycle 1 Femara❌ C2 ❌ C3 ❌ C4 ❌ Due January 2022 with our 🌈

It’s making me worry that I haven’t ovulated yet 😬 first round of letrozole this month and I can tell it’s messing with my cycle