There are two kidneys, one on each side of the tummy (abdomen). They make urine which drains down tubes called ureters into the bladder. Urine is stored in the bladder. Urine is then passed out through a tube called the urethra when we go to the toilet.
This is a companion discussion topic for the original article at https://patient.info/pregnancy/pregnancy-complications/urine-infection-in-pregnancy