Implantation bleeding?

I have brown spotting, only when I wipe. I’m about 12-13 dpo. My period was supposed to start today but hasn’t yet. Spotting has been happening for 2 days now.

I took a couple pregnancy test earlier this week, but they looked like indent lines on them.

Could this be implantation bleeding?

Only symptoms I’m having would be considered “normal” pms symptoms..