If OvuFriend has marked ovulation on your chart with a dotted line (tentative ovulation), it means that ovulation might have taken place, but its occurrence is not certain (you will be informed about this by the Fertility Detector). This happens when there is an insufficient number of fertility indicators present, or some other phenomena occur that distort a clear interpretation of the chart. The table in the Fertility Detector allows you to check which fertility indicators confirm, and which deny the occurrence of ovulation on a given day. For example, if a "no" appears in the table by the statistics and by cervical mucus in the column "confirm ovulation?", it means that the date of the determined ovulation falls outside of the expected time of ovulation, and that you noted infertile cervical mucus or that fertile cervical mucus appeared after ovulation (which might suggest a different ovulation date).