Do you have a picture If your test?
i tested before my period was due with first response and nothing came up.. The day after i used clear blue got two faint lines you literally couldn't see!!!!!
The next day I done another clear blue,. Faint line again but you could hardly see it.. I edited it on my phone and it was clear there was two lines..
still not convinced I bought a clear blue digital and first response
the digital said "not pregnant" the FR had two clear pink lines...
You can go on and on forever.. And I'm definetly pregnsnt😛 i think all tests work different for people xxxx