Three plus urine leukocytes in pregnancy suggest a urinary tract infection, which when present can be accompanied by frequent, urgent and painful urination. When this happens, you can take medication under the guidance of a urologist, and the condition will improve. If there is no big performance at this time you can drink more boiled water to flush the urinary tract, which can treat and prevent urinary tract infections. Try to drink a lot of boiled water later in life and keep the vulva clean and dry to avoid the inflammatory stimulation of the vagina that can lead to high white blood cells during pregnancy. After a period of treatment, it is important to go to the urology department for a routine urine examination to rule out the presence of persistent infection. It is not absolutely impossible to use medication during pregnancy, but the use of medication that does not affect the fetus will not affect the health of the fetus.