I know this is old, but it was only giving you an O because of the OPK (it will give you an eggie on the day after your last positive OPK), if you take away that option in your cycle preferences, it wouldn't give you an O. At the time that this chart was posted, you did not ovulate yet. O was probably delayed due to your illness. Your coverline was correct and you did not have a thermal shift yet. If CD 15 and 17 were 1/10 higher, then you would have O'd on CD 14 with a CL of 97.8, but since those temps are on that line, they are not above the coverline.