I am very regular on my period and NEVER spot any earlier than a day before AF. I got positive OPK results on CD11 and CD12 and of course BD'ed those days as well. Now it's 5DPO and I am having light spotting - only when I wipe and light but definitely there. Also was slightly brownish most of the day and has tapered off since this morning. Is it too early for implantation bleeding? What could this be? I've never had spotting this early in my cycle before.