I'm becoming incredibly frustrated. I have been spotting for 5-6 days before AF arrives for a few cycles. I have a 26-27 day cycle, ovulating on cd15. Do you still get the temp shift if you have low progesterone? Even if I wasn't TTC, spotting for almost a week before AF just plain sucks! How did you know you had low progesterone (other than blood tests) and what did you have done for it?