Faint positive or evaporation line?

Hey ladies. I had an iui done 12 days ago.. i know im not suppose to test until im 14dpiui but I found a cheap walmart test in my bathroom so I took it. It looked negative so I put it to the side & went to pick my daughter up from school. I just happened to remember it was sitting there & see a second line. Faint but it's there. It could be an evap line but I compared it to my test I took at 4dpiui when my trigger was still in my system & they look identical. What do you ladies think?