What does this meaaannn

M. 🌻 • PCOS & Pregnant with our rainbow 🌈❣️🌻
A couple days ago I had a positive test a VERY faint positive but it was positive. 
I took another test today & you can only see a line with light shining through the back and it's hard to tell if it has color or not because it's faint. Idk what's going on? 
Both taken with FMU, & first response tests. 
Im 3 days until my period (at least that's what the app says) 
UPDATE: I shined light to the test again after the time limit & the line is gone??? I know if they are faint positives they fade away after a while, I don't even see an indent or evap line?? So is that a good sign? Lol. 
Also, this isn't my test but this is similar to what it looked like. (I couldn't get a picture because I only have 1 phone lol. But this is what I was pretty much looking at) 

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