Positive then negative ???

Kyra

So I did a first response test yesterday and in the time frame a faint pink line came up was definitely noticeable but 10 minutes later completely faded to a grey superrrr light line, would you consider this positive still? Has anyone had this happen? I’m getting some different tests tomorrow to take

First pic was the line when I noticed it fading

Second pic was when I noticed it was just about gone