Please could you add migraine to the ovulation tracker. It's not just being used by women who are trying to conceive, it's being used for anything that can be hormonally related, and menstrual migraine is a biggie. It's not the same as headache, and simply charting headaches does not give a good overview of hormonally-based migraines (for instance, I can get headaches at any time, but migraine only during my period).
I would also suggest adding depression and perhaps one or two other psychiatric symptoms appropriate to PMS/PMDD. PMDD is a life-threatening condition as it is a leading trigger for suicide in women, and as such should be taken seriously. Being able to chart the symptoms is enormously important.
As I suggested in an earlier post, please could you also make it possible to put in a line for the start of each menstrual cycle as well as the line for ovulation, as it makes it far easier to get an overview of charts that way.