I had spotting on cd 10, 11 & 12 before my BFP at 14dpo when I was PG with my DD. See my chart here (the bottom chart) http://www.fertilityfriend.com/home/240d3b
Youve really thrown a spanner in the works for me! Especially since your temp came right down as well - did you look at my chart? Maybe I implanted late? Maybe ive just got AF? Maybe im just losing my mind? Argh!