Under normal circumstances, the color of urine should be light yellow, clear and transparent. The possible reasons for the yellow color of urine during pregnancy include: 1, the urine is concentrated due to low water intake during pregnancy, and the color of urine is yellow. 2, the liver function is abnormal during pregnancy due to various reasons, and the bilirubin is elevated, making the color of urine deepen. 3, the urinary tract is suffering from urethral stones or urinary tract infection during pregnancy, and there is a small amount of bleeding in the urine, making the color of urine yellow. 4.Take some vitamin drugs during pregnancy, such as vitamin B complex, gold vitamin, multivitamin element tablets, etc., resulting in yellow urine color.