Can someone help me understand what’s going on?

Hi all! My husband and I are TTC and I’m currently six days late for my period. Last pregnancy test I have taken was Friday.

Saturday I took an ovulation test I don’t know why but I did and it had a faint line. Tonight, Sunday, I took an ovulation test thinking nothing would’ve changed as I still haven’t gotten my period but it’s much darker..

Why is my ovulation test getting darker but I haven’t gotten my period? And my last pregnancy test on Friday was negative.

Photos:

Pregnancy test: August 23rd

Pumpkin ovulation test: August 25

Bathroom ovulation test August 24

Miss period due date August 21