Implantation or miscarriage

Deb • Thu, Aug 25 • Mom of DS (March 2020). Mom of DD (August 2024)

I have started spotting mildly brown blood when I wipe at 12 DPO after a faint BFP. How long after an implantation bleeding can one have a positive beta HCG in blood? FYI, I had a negative blood test today. Is it still too early to get blood work done on the day of implantation bleeding? Looking for some hope.