Am i going nuts?

When i take each test it's a faint positive. I'm 16 dpo. I have taken different tests in front of different people and they all see it too. It's hard to get a good picture. Since Friday I have been getting the faints, but they aren't progressing at all i feel like. I was thinking maybe a chemical, but i haven't had any bleeding at all and i was supposed to start Saturday. What do you guys think? Chemical? We're just seeing things? Something else? Any advice is appreciated!