Unsure???

Shawna • TTC 👶🏽 #1 with my handsome fiancé
Ugh😔 So I've been taking pregnancy test every morning for the past three days and they don't seem to be getting anymore darker. I was told that it looks like there's a line. The only thing is, is that the other people and I don't see the line unless it's inverted. What could that mean? (I take the picture during the time frame)