Search Properties The calculation of ovulation according to physiological characteristicsIn addition to all the above methods for calculating fertile days, there is a method that can be used independently (without the help of a specialist) by any girl. It is enough just to carefully observe your own body and trust Mother Nature. To calculate the day of ovulation, there are a number of physiological signs:• The nature of vaginal discharge;• Soreness of the mammary glands;• Increased libido (sexual attraction to a partner);• Emotional irritability;• Discomfort in the lower abdomen;• Changes in well-being.