Just remember the coverline is just an indication to see an increase in temperature, your temperature does not necessarily have to stay above. And rest assured a temp falling below doesnt mean there is something wrong...a couple of times in various cycles I had a few temps below the line. Just wondering how you take your temp? Only because oral temps can be alter a bit and sometimes vaginal temps give a better result. I found fertility friend website really good for information about charting - have a look