What should you know about blood in urine in the first trimester?

Blood seen during urination may come from the bladder or kidneys, or it may be vaginal bleeding noticed at the same time. A urinary tract infection can present with blood, burning, urgency, or lower abdominal discomfort. Kidney stones can present with blood and severe side or groin pain. A kidney infection can present with fever, chills, vomiting, and back pain and needs prompt treatment. Pregnancy can change urinary symptoms, so absence of burning does not settle the cause. Prostatitis, prostate conditions, bladder cancer, prostate cancer, and sickle cell disease are other possible urinary causes in the wider population, although they are not the usual focus in early pregnancy. Blood in urine does not by itself show that a pregnancy problem is present.

Contact your obstetric or primary-care team the same day for advice about visible blood or a urine test showing blood. Tell them whether blood appears in the urine stream or on wiping, whether you have cramps, fever, burning, back pain, or clots, and your pregnancy details. They may request a clean-catch urine sample and may examine for infection; use only medicines approved by your pregnancy care team. Do not take leftover antibiotics or assume that increased fluids will resolve the cause.

Go to urgent care for heavy vaginal or urinary bleeding, severe one-sided or abdominal pain, shoulder-tip pain, dizziness or fainting, fever with shaking chills, repeated vomiting, inability to urinate, or feeling very unwell. These warning signs need rapid assessment of both pregnancy-related and urinary causes.

How can we tell whether the blood is urinary or vaginal? Should I provide a clean urine sample? Which pain medicines are suitable in pregnancy? Which symptoms require immediate assessment?