False positives?

Victoria

I’ve taken 2 pregnancy test one clear blue and one first response.

I had what I think is a indent line for the clear blue (it’s happened before really annoying) but it had colour and was a thin second line.

Went to the shops and got a first response (because I know some people recommend red dye) and it had a strong faint line if that makes sense lol.

Did a second first response and came back very negative. Huh?! I’m confused. Have I just managed to use two different brands and have indent lines and then not?

I am also 1 day late for my Period which normally works like clock work.

Please help if you know if tests can do this. Maybe it’s a little early to tell I’m not sure.

Anything right now would be appreciated because I’m not sure What to do