Line on OPK getting lighter?

Natalie

This was an OPK from this morning.

I thought it was almost positive so I tested again this evening and this is what it looks like.

It’s def lighter so did I miss it? Was the first one positive or do you think the first one was already after a positive? I only tested yesterday morning so maybe I missed it yesterday and should have tested in the afternoon? Idk what do you guys think?