Please help! Faint line turned into nothing after time frame passed. Normal??

Kathy • Baby Boy - IUI - November 2019 Baby Girl - IVF - January 2023

So, I know I shouldn’t look after the allowed time frame but did anyway. I had a noticeable faint line around 3 min mark. After about an hour I went to check it again with no sign of a line. Is this normal? Was it really a BFN after all?

Scheduled with the fertility specialist for first visit tomorrow after TTC for over a year.

Early photos. Noticeable line after 3 min mark. See top photos.

After an hour-ish I went to check it out again and no line in sight. Bottom photos

Lines above, no lines below.