Disappearing Line???

I am 12dpo, 26cd. I had (what I think was) implantation bleeding on 7dpo (dark brown discharge twice when I wiped). Had cramping 7-12 dpo.

Tested negative 10 and 11dpo 😞 BUT today (12dpo) I swear there was a faint line and then I looked back after a few minutes and it was gone. I was so happy and then so disappointed. AF is supposed to come in 2 days. I know I should wait but I’m so impatient.

Here’s my BFN 😞 (Pic taken under my desk at work bc I bought a new box of tests this morning and couldn’t wait LOL)