Am I in my fertile window or not?!

So, according to Glow and Ovia, I'm in my fertile window right now. I've taken a couple OPKs and the test line is actually darker than it normally is for me at this point in my cycle (CD 12); however, I don't have any fertile CM and my cervix feels low and firm. I usually ovulate around CD 16 and have lots of EWCM at this point in my cycle. What is going on? Judging by my OPKs I should be getting peak in around 2-3 days, so why is my body not showing any signs of fertility?