Line not getting darker

Alicia

I’m so confused! I’m due for AF tomorrow. I have been crampy for the last week, sore boobs, loss of appetite. Got a Vfl on 12/31 (10 dpo) and it got darker on 1/1. Didn’t test yesterday and today is the bottom one (13 dpo). Did it not stick? Or is this normal? So confused 😫