Anyone have experience with Proov Progesterone test strips?

I’ve gotten a little obsessive this month and bought Proov Progesterone strips. For those of you that are unfamiliar, one single line indicates positive (you’ve ovulated and progesterone levels are rising/at appropriate level). If you get even a faint second line, it means negative or that it’s rising but not at level yet or you did not ovulate. I’m 8 DPO and I just tested. In one light, it looked like a clear positive (one line). In another light, there was a vvvvvvfl indicating slowly rising. But I’m at 8DPO also shouldn’t it it be a solid positive by now????

First look, clearly one line - positive

Second look - vvfl suggesting negative