I've been tracking my morning temperature and CM for about a year now, but have only put a few cycles into Fertility Friend. (It's so much more convenient now that I have a smart phone!) I don't feel confident at all that I've ovulated, but FF has thrown crosshairs on my charts nonetheless. I know its just a computer program making its best calculation based on the data, but is there a point at which the app will say "I can't pinpoint ovulation based on this information"?