Agreeing with wishes, it's normally just a small amount when you wipe or a few spots in your underwear. It usually will only happen on one or maybe 2 days. Saying that, one of my friends actually was 2 months pregnant when she tested because she thought she'd had her AF the month before. It's very unusual to get implantation bleeding like that though.
I had it, but like the others said it was such a small amount I wouldn't have even noticed if I had been looking. It wasn't really bleeding it was just a light pinkish tinge on the tissue when I wiped a couple of times.
I read that only 1/3 % if women will notice IB, so if you don't get spotting...don't get your hopes down if you don't see anything. As for how long it lasts, i'm sure it's going to be the same answer as most everything and that every woman is different. I've read everything from it being light spotting to looking like an extremely light AF.
Im on CD 25 of 26 on CD 23 when i wiped there was a blob of pinky/mucky sort of colour CM and then the same yesterday and today and nothing other than that ive not a clue whats happening??