Help ?? OPK?

Devin • Mommy & wife 💍 👦🏼🧒🏼🤰🏼

First time using them and the screen is just blank !? Nothing showed up not even the control line. Idk what I did wrong. It said hold it in my urine stream for 5 seconds and I did. Why would nothing show up ? 😑 totally discouraged now