can someone tell me what exactly "implantation bleeding " is? I've taken 3 tests now, all negative and I'm 9 days late. Today I'm having a light pink/light brown discharge. Do you think that's what it is and I'm just too early to get a positive yet or do you think it's the start of a period? My periods are always a LOT more red and a lot heavier though. I've never had anything of this consistency. It's gross. Lol