Apr 10, - Most of it is cervical fluid, and it changes along with the menstrual cycle. "Ovulation discharge" has the quality of an egg white. It's when the hormone progesterone peaks in your body. When estrogen is the dominant hormone, discharge tends to be clear, stretchy, or watery. Progesterone, on the other hand, turns mucus cloudy or white. White, thick discharge is considered infertile cervical mucus.What it is · Causes · What to expect.