Implantation bleeding/start of AF

Today I am two days late, 15 DPO and I have 32 day cycles. (CD 35 today) I have experienced some light brown spotting. I’ve had negative pregnancy tests this entire time. I read it’s good to test 3 days after you’ve experienced spotting?? This photo is recent, it’s lighten up a lot since 10AM when I noticed it. I swear I’ve had VVFL but line eyes and blue tests are the worst combination. Took a FRER but couldn’t tell if it was faint or indent. Any advice or personal experience? Starting to think I’m out and losing hope. 💔