Implantation bleeding?

I am 8do (8 days after ovulation) and am experiencing some light-medium spotting. The blood is dark brown and slightly red when I wipe. But it's not heavy enough to fill up a pantyliner. I also noticed a small blood clot in the toilet. This doesn't look or feel like my normal period and I have no cramping whatsoever. I do feel a little more sleepy than usual today. Any ideas on what this means? I'm been ttc for almost 9 months now...