Very faint positive at 4 weeks?

Leah • ✨Leah✨PCOS 👣🌈 Angel baby 12-13-17 👶 Arianna Kaitlin 8-24-09💜 Engaged 💍 Rainbow baby due 11-21-2020 🌈

Tested tonight to see if my lines would get darker but instead there very faint. I'm suppose to be 4 weeks tomorrow. First 2 pics ars from 10/12 at 9:57am second 2 pics are from 10/15 at 10:14pm. Why are my lines not getting darker? Tomorrow is suppose to be period day.