Darkened positive or evap?

Sidney • Baby Emerson 02-04-2020👶🏼 Mom to 3 fur babies🐾

Took this Walmart test this morning and I could swear I saw the faintest of lines. (First pic) I took pictures and just left it and continued my day. I went back a number of hours later and just happened to glance at it and was super confused. (Second pic) I’ve never had an evap with this brand but I know this is what it could be. I stg that I saw the faintest line this morning. Could it be just the line darkening or is it definitely evap?

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