I Have had the same things going on, Sometimes I have a 31 day cycle and other months its 35 days. I am coming off of a 35 day cycle and started my last AF on Dec. 11th. For the past four days I have been on and off spotting, and it has been an array of colors. I have never spotted before with any cycle. So not sure if it is a form of implantation bleeding, a very very light period or something else. I am waiting till next thursday to test just in case its a really funny cycle. But am Hoping for BFP!!