Very faint line

Took an 88 cent test from Walmart and within the 10 min mark I could see the faintest of lines and it's pink. It's so faint the camera won't pick it up but I can for sure see it. I have not had any problems with these tests so I want to believe it's real but don't want to get too excited. Been trying to carry second for two years. I am just giving it all to God. However the question I have is has anyone had that extreme faint of a line that the camera wouldn't pick it up on the cheapie tests and it was a true positive?