Delayed menstruation is often clinically related to pregnancy, endocrine disorders, and gynecological diseases such as polycystic ovary syndrome. Oral medications can also cause delayed menstruation, such as progesterone or birth control pills, which can delay menstruation. It is recommended to rule out the possibility of pregnancy first, and then give relevant treatment. Yellowish leukorrhea is not absolutely related to delayed menstruation. Yellowish leukorrhea is often associated with vaginal inflammation, as well as chronic inflammation of the cervix, which can also cause leukorrhea to appear yellow. In addition, inflammation of the pelvis can also lead to yellowing of the leukorrhea. Therefore, it is recommended to have a gynecological examination and take the leukorrhea for laboratory tests. Laboratory tests will help you to understand the pathogen of the infection, or where exactly the inflammatory reaction is caused, and then treatment will be given.