I sometimes get a teeny amount of brown CM just before AF arrives, literally seconds before.
Yesterday I had a teeny bit so thought oh, perhaps AF will be 3 days early so waited but nothing. This morning I had quite a bit of brown CM but still nothing. Arh. 
What does this meeeaaaannnnn? Is this a normal symptom people get before AF that suddenly my body wants to do (of course during the time I am TTC, just to toy with me)? Or is there a possibility I am up duffed.
I'm pretty sure I ovulate quite late in the month (CD 15 last month). I am probably now 13 DPO