Can't tell if the line is getting darker (OPT)

Sarah
I just did my first round of clomid and am awaiting a positive ovulation so I can get <a href="https://glowing.com/glow-fertility-program">IUI</a>. I am using the Clearblue and the cheap dollar tests... And I can't tell if the lines are getting darker, lighter, or staying the same! Rawr! What do you think?