Any advice would be nice

Meg • 👨‍👩‍👧‍👧. Mom to👧. 👼. 🌈👧🤰

I'm just a little confused. I took an opk this morning and it was really negative I think. The test line was a lot fainter. I now just took another one because i thought why not?

Now i know it's not positive but it looks closer... how come this morning seemed like nothing and this evening is looking darker? Has anyone else had this happen?