Glow is off?

Paulina
So Glow is telling me my most fertile day will be in 2 days. I've been taking OPKs this cycle just to be sure and to get to know my body better also. 
​I think Glow must be off. Shouldn't the OPK detect an LH surge? 
​My other app (Naturale Cycle) tells me I will ovulate the 12th. 
​Anybody in the same situation?