Why did Glow add a coverline and move my ovulation day? Is it because of the missing data? I had a chemical last cycle, so I am missing the first few days of temps, but I think I ovulated CD 14, which is what it's been all week until this morning. CM patterns would have indicated that as well. Glow has never even given me a coverline before. I had to make it up myself. Past cycle coverlines have been 97.4.