Ovulation fluid is human vaginal discharge, also known as "mid-menstrual discharge" or "ovulation discharge". It is one of the female physiological phenomena. It is composed of women's vaginal secretions, which contain nutrients such as protein, white blood cells, vaginal glycogen, calcium, phosphorus, vitamins, and bacteria.

Changes in ovulation fluid include the following aspects:

1. Color: Ovulatory fluid usually becomes brighter in color and thinner, similar to clear fluid or nasal discharge.

2. Texture: The texture of ovulation fluid becomes thinner, the fluid becomes clearer, and there may be some foam or libido.

3. Odor: Ovulation fluid usually does not have a strong odor, but if a woman's vagina is infected with bacteria, it may produce some odor.

4. Quantity: During the ovulation period, a woman’s vaginal discharge may increase, and the average daily amount may be between 100 ml and 200 ml.

For women who want to become pregnant, it is very important to understand the changes in ovulation fluid. If a woman misses her ovulation period, she can predict her ovulation period by monitoring her body temperature, using David test strips, or performing a B-ultrasound examination. At the same time, women should also maintain personal hygiene and avoid bacterial infections to ensure good health and fertility.