OPK question

Kris

Okay so prior to 10-21-19, all my OPK results shows a light line in the test area. On 10-21-19 I got this

Then on 10-22-19 and 10-23-19 the OPK results are back to showing the test line being much lighter than the control.

Then today, 10-24-19, I get this

What’s the deal? I’m kinda confused why it’d be light, dark, light again then dark. Can anyone shed some light?

Also to note, I have PCOS and this is my first round of 2.5mg Femara.