I'm worried because my part seems to be getting wider and wider.

Lately, when I tie my hair up and look in the mirror, my parting looks wider than before.
Comparing the photos, it feels like my scalp is a bit more visible than it was a year ago, so I'm not sure if it's just my imagination or if my hair has actually thinned.
It’s even more ambiguous because I don’t feel like I’m losing a lot of hair.
For those of you who discovered your hair loss due to a change in your parting, I'm curious if you consistently compared photos and how the hospital confirmed it!