Does anyone know how to reverse image a photo?

This was taken this morning, in the light of my bathroom there is a hint of a line but its hard to tell in the photo. This was taken just after 3 minutes. Period is due tomorrow.

This is the same test taken at the 5 minute mark but still hard to see a line

And this photo is of a test I took yesterday. There was nothing during the time frame but when I checked it a few hours later there was this line. Yes I know the test is invalid by that point but there would be no line if there was no chance of being pregnant right??

The line has color in person hard to tell in the picture