Increases in vaginal mucus discharge generally have nothing to do with fertility. The nature of vaginal mucus changes and the quantity increases during normal sexual excitement and in cases of inflammation and infection.. . The changes associated with ovulation occur in the cervical, not vaginal, mucus. For most of the menstrual cycle, the cervical mucus is thick, scant and impenetrable to sperm. During the four to five days around the time of ovulation, the mucus changes to become copious, watery, thin and readily penetrable to sperm. This change in cervical mucus is usually not apparent to the woman and so cannot be relied upon to ascertain the time of ovulation and the subsequent "safe period.. i hope if the discharge is itchy,smelly,different colour or frothy,u may need further investgaton by meeting your GP.if u have a further doubt contact me...