Let me start off with saying that I am not TTC. I figured the ladies that are would know way more than I would. I don't chart since I do not sleep well and am up multiple times a night, and I have insomnia. I usually go off of my CM to estimate on when to avoid sex or whatever. I'm currently CD26, 24 hrs ago, I started spotting and cramping. I assumed AF was coming - it's not abnormal for me to start on CD26 as my periods can range anywhere between 23 and 35 days. I go to bed, wake up in the morning and I've got full fledged cramping, back pain and a migraine.. all signs of AF. I was still slightly spotting but as time goes by, it's becoming less and less, almost non-existent. I've never had spotting that didn't have AF come within 3 or 4 hrs later. I'm going to guess that I'm between 10 and 12DPO. Could this be implantation bleeding, AF on it's way in a strange and abnormal way for me, or something else completely different?