Any insight?

Chelsea
Hi! I'm 12dpo and this morning (sorry tmi) I started spotting light brownish red blood. I put on a panty liner but there was so little it never showed up on panty liner just tp. Now this evening it's completely stopped. I've had some cramping this morning and yesterday but now they're pretty much gone. I was sure  it was just an early af since I had a bfn yesterday, but normally when I start it gets heavy right away. Has anyone had implantation bleeding at 12dpo? I really don't know what to think now! 😕 thank you!!!