False positive?

I am 12 DPO at 11 DPO I took a test before I went to bed and got a really really faint line. I thought I was crazy so I went and bought another test and took it again and the line was still faint but more noticeable. I then took another one this morning and it was negative. I took another one after that to be sure and it was negative. I was so excited for the line and now I'm bummed. Was that a false positive? I have 2 says until I'm supposed to get my period so I'm assuming the negative is right. Why me?!