I took two Walmart test and I saw a line show up almost right after but it is so thin. Could this be evap? The fist picture is the first test and now after the time it has a darke smudge.  Took another this morning and same line just thin, I have taken these before but never anything just bright white. I am hoping that it is just early and when I test again in a few days that it is darker and wider. Just want to know if I should buy a different brand when I test again?