How long after implantation do you get BFP?

Pretty sure I’m 8 dpo, this morning I had some reddish brown, gooey (sorry) discharge when I wiped and then nothing... wondering if it could be implantation as I’ve never had anything like this mid cycle.

I want to test so bad but feel it’s too early to get BFP even if it is implantation bleeding! I’m so impatient 🤨😤

Anyone else experiencing symptoms 8 dpo ? ✨❤️ I’ve noticed dizziness, extreme fatigue, dull headache, prominent boob veins. No nausea or mood changes really.