So I don't normally ovulated until cycle day 15-17, I've been like this for the last 9 months, I was using OPKs but stopped once I figured out how to check CM.

Anyway today is cycle day 13, and I just got home from work and figured I'd check my CM before going to sleep, well the second feel I got like a small mucusy (sp?) glob of blood, it was little and pinkish red. Wouldn't it be too early for implantation? I'm don't have long nails and it doesn't hurt so I don't think I've nicked myself. Is a mid cycle bleed common? I've never experienced this...Please any advice would help.