Implantation bleeding that is, if so when, what was it like, how long did it last and when did you get a BFP?

The reason i am asking is i am 13DPO and getting a brownish/pinkish tinge from approx 9.30 this morning which has completely dissapeared now, i used a liner for it not a pad and got many half a pinky fingers worth now nothing.
I usually have a 31 day cycle (currently CD28) just wanting to compare others thoughts and experiences.
I know 13 days is on the late side of things for O, i rang a friend who works at a health clinic and she spoke to a nurse there and she said it doesnt really how many DPO you are just the IB typically appears when or before AF is normally due.
Now i was thinking I was late as my LP for the last 2 cycles has been 10 days but im thinking maybe they were just "funny cycles" and thinking of going with my regular 31 day cycle dates making af due on friday.
Any opinions or experiences?