Implantation bleeding or who knows what?!

I am a regular 28-29 day cycle and I generally get a positive opk on cd14-16. I had a positive opk on cd 16 so I figure I ovulated on or around cd 17/18.

On the am of CD 29 which would be 11-12 dpo I had pink spotting when I wiped once and a touch of red once when I wiped ten mins later. It wasn’t a full bleed and I haven’t had anything since.

For the past week prior I have been exhausted with very sore boobs and the last two days a low back pain. I always feel the same symptoms before af as well as before a bfp. Anyone else get implantation bleeding this late and get a bfp? I took a test today Cd 30 and it was neg but if it’s implantation it wouldn’t show a bfp for a few days right? Any thoughts?