Implantation bleeding... tell me everything

I’m 13DPO... “ 3 days late” going by last 5 cycles. I’ve done tests and it’s been mixed reviews.

This morning at 8am I went for a wee and no blood but when I wiped it was pink. No pain. Put a pad on and it’s now 10am and nothing on pad. I wiped and it’s now brown spotting. Start of AF or implantation? I have longer cycles than normal. I feel fine in the way that I don’t feel it’s a period. I normally can tell due to pain in my thigh and groin. Any information would be great.