Late AF last 2 days

Hi ladies

So af was 2 days late,than yesterday af came and this morning I only saw a small brown spot on pad (TMI). I changed my pad and nothing. Still nothing. I don't know or even think it's implantation bleeding. It might be to late for that.

I have a 28-35 day cycle

AF usually last 5 days.

I'm on cd33 today and 20 or 21dpo.

Has this happened to any of you ladies?

And would you say it's too late for implantation?

I'd appreciate any response please.