Brown spotting for a week...AF?

[caringo]

So, I never get spotting before AF, that I can remember. For 6 out of the last 8 days I've had brown spotting, at first just a little mixed with some pink, but yesterday I had a TON. I know brown spotting can come before AF for some ladies, but for a week? Also, my LMP ended 46 days ago...could leftover blood still have been hanging around and be just now coming out? I haven't really had any of my other normal AF symptoms.

Any ladies have input?

Also, I don't know when (or if) I O'd.