Very confused - help!

Jessica
On Monday I was 5 days from my expected period. I took a first response test and received a faint line. Tuesday I took a first response test and received a faint line. Wednesday I took a first response and wondfo test - both faint lines. Today (Thursday) 2 days before expected period, I took a wondfo test and a clearblue and both were negative! What does this mean?? I thought faint lines meant positive? Apologies if I am being ignorant - this was our first month trying and I need help! Thanks!!