According to the Feminist Women's Health Center (FWHC) in Washington State, cyclic birth control methods track the ovulation cycle. A woman can become pregnant just after ovulation. FWHC explains that "pregnancy is most likely if intercourse occurs anywhere from 3 days before ovulation until 2-3 days after ovulation."
Body Temperature
Body temperature changes with ovulation. Contracept recommends a sensitive thermometer called a basal thermometer to take a woman's temperature each morning. Contracept explains that just before ovulation the body temperature drops to 97.2 to 97.4 degrees Farenheit and after ovulation the body temperature raises by about .5 degrees.
Other Ovulations Signs
FWHC notes that tracking other physical changes which occur during the ovulation cycle helps determine fertility. These tracking methods include cervical mucous monitoring, cervical observation and noting physical symptoms such as cramping, breast tenderness and blood spotting.
Recording Changes
Results of body temperature and other symptom observations are recorded to find a monthly rhythm. Contracept recommends a natural family planning chart. FWHC notes charting on a calendar is sufficient.
