Thin, Stretchy Vaginal Discharge ​This change in vaginal discharge, known as cervical mucus, is a highly accurate sign that ovulation is approaching or occurring. ​Appearance and Consistency: As estrogen levels rise before and during ovulation, the cervical mucus becomes clear, slippery, and stretchy, often compared to raw egg whites . This is sometimes referred to as "fertile discharge." ​Function: This consistency is vital for fertility. It helps to nourish and facilitate the movement of sperm