The interplay between the female sex hormones called estrogen and progesterone is mainly responsible for the bodily changes that take place during the different phases of the menstrual cycle. Even the color, texture, and the amount of discharge may vary, depending on the time of the cycle. For instance, the amount of discharge is likely to increase when a woman is ovulating. Though slight spotting is not really a cause of serious concern, consult a gynecologist if you experience other symptoms.