Help.. I’m so confused

Pe

So Glow says ovulation is in 2 days and I’ve been using OPKs since the start of my fertile period. Last few days the OPK was getting darker but this morning it was really light. I confirmed with a Clear Blue digital OPK and it was negative.

My BBT has been constant and no EWCM yet.

Can LH fluctuate before ovulation?

What’s the likelihood that I’ve missed my surge?

Usually Glow predictions are pretty accurate within a day or two for me so I’m really confused.