11 dpo too late for implantation bleeding?

kristie

Waiting for af as all of my tests have been bfn (I'm currently on day cd42 I have long cycles) but according to my chart I'm only 11dpo, had a streak of dark blood on a panty liner today but nothing since then.

My boobs are sore which isn't out of the ordinary when I'm expecting af but my nipples are incredibly sore and painful which i never have.

Opinions?