3 different brand of Pregnancy Tests

I've been testing since Thursday, I supposedly had my first possible positive test (or could be false positive) on a First Response.

I taken two more other brands, Clear Blue and a dollar tree pregnancy test. Those came out negative, my suppose period date is on the 28th, according to glow. 4 more days.

The Dollar Tree and Clear Blue are still negative but I'm getting actual pink lines on a First Response and I've taken 4 of them. I also taken a Digital on Thursday or Friday and its a negative. I don't understand, if I'm pregnant. Shouldn't I have a faint line on a Dollar Tree or Clear Blue test as well?