I really just can’t stop thinking about it..

Monday morning I was two days late for AF. I took a test and I got a vvvfl (pictured below) so about 1.5 hours later I took another one (same brand) and a .88c Walmart one. Both showed up negative. So I went and got a blood test done & My doctor called me and said “it’s undetectable, which means negative.” I believe it was the quantitative blood test.

So I took another one Tuesday morning and got another negative. Took one last night and got a negative. I am now 5 days late.. What is going on? Any opinions why I got the faint positive?