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Changes in the urinary system during pregnancy. The body goes through many changes during pregnancy. Significant anatomical changes occur in the urinary system. Under the influence of the hormone progesterone, the kidneys and the ureters dilate. This can lead to a slow down in the flow of urine through the ureters and therefore an increased risk of urinary infection in pregnancy.
Frequent Urination. Frequent urination is one of the early signs of pregnancy, occurring at around 6-8 weeks into the first trimester. The hormonal change in the body causes increased blood flow through your kidneys, filling your bladder with urine more often.