The faint line you see is the chemical placed there that reacts. You should be able to see it regardless.
what they mean by a faint line is positive they mean if the line is colored pink but light, not if you can see the discoloration at all.
You look good here.
By the way I have had COVID at least 7 confirmed times. It is a serious disease, and be mindful of course. But I wouldnt let it stress you too much. Not the end of the world if you get it.