Cervical fluid is a fluid produced by the cervix, the lower, narrow end of the uterus that opens into the vagina. It changes in consistency and amount throughout the menstrual cycle, and can be used as a natural method of birth control known as the cervical mucus method.
To check for cervical fluid, insert a clean finger into the vagina and feel around the cervix. The fluid will be clear, white, or yellow, and will vary in consistency from sticky to slippery. The consistency of the fluid can indicate the phase of the menstrual cycle. For example, during ovulation, the fluid will be thin and slippery, while during other phases of the cycle, it will be thicker and stickier.