Your urine may change in smell and color during pregnancy. The hormones your body is manufacturing are excreted in your urine thus changing the color and smell. If you find this unpleasant, increase the amount of water you consume. It will help dilute the urine and lessen any changes in smell. Also, changes in color and smell of your urine may indicate a urinary tract infection. If you have any burning while you urinate, make sure you discuss this with your OB and do not ignore this symptom.