Leukorrhea begins during the first trimester. Many clients notice a thin, colorless or yellow vaginal discharge throughout pregnancy. Some clients become distressed about this condition, but it does not require that the client report to the health care clinic or emergency department immediately. If vaginal discharge is profuse, the client may use panty liners, but she should not wear tampons because of the risk of infection. If the client uses panty liners, she should change them frequently.