Ok so I'm new to <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>..And to be honest not really sure how it really works... But I also have pcos and I've heard that opks are sometimes unreliable..Glow says today is the first day of my firtile week and I've been testing for the last 3 days.. for the first to I was using blue dyes that there's was always 2 lines but the they never got darker.. And today I'm using pink dye ones and there was only one line.. which I realize is negative.. My question being if I am in my firtile windows shouldn't there be a hint of a second line forming? And then just continue to get darker?? Plz help any advise is greatly appreciated