Faintest line ever or Evaporation?

I definitely see SOMETHING, but what?

I have been nauseous most of the day (late morning/all afternoon), which sparked my interest since we are ttc. So, against my better judgment...I tested in the afternoon (still a bit before my AF is due). I probably will retest in the morning, but thought I'd see what someone else thought. 🤷‍♀️