The second half of the cycle usually lasts from day 12 to 16. This can help you when interpreting your temperature curve. The rise in temperature should occur around two weeks before the onset of menstruation for the following month.
By taking the length of your average menstrual cycle and the date of your menstruation, the calculator works out the time that ovulation is estimated to occur. Ovulation typically happens about two weeks before the next menstrual period begins, so your ovulation will depend on thelengthof your a...