Chemical Pregnancy?

So I’m hoping for some opinions. I’ve been reading a lot about chemical pregnancies and now I can’t tell if I’m having one or if I’m just extremely paranoid because I feel like I see it happening so much in here. So below are my four tests from today taken at 3 different times. The first one is significantly darker and then it begins to fade as the day goes on. I’ve read this is what happens in a chemical pregnancy, you get a positive and it starts to fade to negative. Is this what’s happening here?