Chemical pregnancy??

September 29th I took a pregnancy test and got a faint positive.

then I took 2 blue dye tests. one that night and one the next morning. the top was at night and the bottom one was the next morning.

then about a week later, I took a digital....

could it have been a chemical or just negative to start with and I just got faulty tests. I still haven't had af come and I got another negative test a few days ago. what's going on ... ? every time I look at those tests my heart breaks a little. I don't want to believe I lost a baby but it's hard to believe I got TWO faulty tests give me the same results...