Hello, I hope I can help you today. Protein in the urine during pregnancy can have many causes, including urinary tract infection of the bladder and/or kidneys. Furthermore, the pus, or white blood cells, in your urine can also be an indication of continuing infection. Therefore, if you had a kidney infection the week before, your doctor may be sending your urine to the hospital to be analyzed for culture to make sure your urinary infection is gone. Untreated kidney infections can be dangerous during pregnancy because the bacteria from your urine can actually pass to the blood and affect your whole body, a condition called sepsis, which can cause severe complications for both the mother and fetus. Sometimes, a kidney infection cannot be cured with oral antibiotics alone, and women need to actually be admitted to the hospital to effectively complete treatment. So I suggest that you follow your doctor s advice, and depending upon the results of your urine test, you may need additional antibiotics or even inpatient admission for treatment of your condition. I hope that I was able to adequately answer your question today, and that my advice was helpful. Best wishes for the rest of the pregnancy, Dr. Brown