First time using opk

Samantha • Married 06/07/17 💖 mc 11/01/16 👼🏻 gave birth to a baby boy at 21w2d 04/06/17 👼🏻 Emiliano Gabriel 09/22/18

First time using these and just wanted to know if I’m doing it right. There is only a couple days where I have taken two because i keep forgetting to take a second one 🙄