
Hi and welcome!
From the instructions on my tests, it says that the test strips will hae control lines that vary in color, but that the only thing that matters is if the test line is the same color or darker than the control line. So no matter what color the control line is, if your test line is the same color or darker, you probably caught your surge!
When do you test during the day? Sometimes, your LH surge is so short that you might miss it with an OPK.
Hopefully you get your BFP soon!