Conflicting test results…

So I took a pregnancy test Day after I was supposed to start AF. I used FMU and it was a blue dye test, it came out with a very faint positive. I went and picked up more tests (pink dye this time) and decided to test again the next morning, to which I didn’t see a second line… is this common? I’m still late, my body temperature has increased, I’m way more thirsty than usual, I’ve had itchy nipples (was my only symptom honestly with my first pregnancy). I just don’t know if I’m testing too early or I’m getting myself hyped just to be disappointed :(