UTIs During Pregnancy: Symptoms, Treatment, and When to Call

There is a particular kind of uncertainty that comes with pregnancy when something feels slightly off — but you cannot tell whether it is pregnancy off or something-is-actually-wrong off. Needing to pee constantly? Very pregnant. Pressure around your bladder? Also very pregnant. Wondering whether that tiny sting you felt means you have a urinary tract infection? That is where it gets less obvious.

Urinary tract infections are common in pregnancy — they affect roughly 8% of pregnancies — and pregnancy itself creates urinary changes that make the symptoms surprisingly easy to overlook. The reassuring part is that UTIs during pregnancy are very treatable. The important part is that they should be treated rather than ignored, because an infection that stays in the bladder can travel upward to the kidneys and become much more serious.

Why UTIs are more common during pregnancy

Pregnancy changes the plumbing. Progesterone relaxes smooth muscle everywhere, including the ureters, so urine moves more slowly from the kidneys to the bladder. A growing uterus presses on the bladder and makes it harder to empty completely. Urine in pregnancy is also slightly more hospitable to bacteria.

Slower flow plus incomplete emptying is exactly the environment bacteria like. None of that is anything you did wrong — it is anatomy under new management.

What a UTI during pregnancy feels like

The classic signs are the same ones you would notice when you are not pregnant:

• Burning or stinging when you urinate
• Urgency — the feeling that you have to go right now, then very little comes out
• Pressure or cramping low in the pelvis, right over the bladder
• Cloudy urine, or a strong or unusual odor
• Blood in the urine, even faintly pink
• Feeling unwell in a vague, low-grade way

Any one of those is worth a phone call. You do not need all of them.

UTI symptoms vs. normal pregnancy symptoms

This is the part that makes women second-guess themselves, so here is the simplest way to hold it:

Frequent urination without discomfort is usually pregnancy. Frequent urination with burning, urgency, pain, odor, or blood is worth a call.

Pelvic pressure alone is common and normal. Pressure paired with stinging is different. The signal is not how often you go — it is whether going hurts.

The three types of urinary infection in pregnancy

Asymptomatic bacteriuria. Meaningful bacteria in the urine with no symptoms at all. It sounds harmless, and outside of pregnancy it often is, but in pregnancy it is treated because a meaningful share progress to kidney infection if left alone. This is exactly why your provider cultures your urine early in prenatal care.

Cystitis — a bladder infection. This is the one with the burning and urgency. Uncomfortable, common, straightforward to treat.

Pyelonephritis — a kidney infection. The serious one. Fever, chills, nausea or vomiting, and pain in the flank — the side or the mid-back below the ribs. This is not a wait-until-Monday situation.

How UTIs are tested and diagnosed

Your provider will ask for a urine sample. A dipstick gives a fast answer in the office, and a urine culture — which takes a day or two — identifies the actual bacteria and which antibiotics will work against it. That culture is why guessing at home is not worth your energy: the test answers in two days what you could spend two weeks worrying about.

Most practices culture urine at least once early in pregnancy even when you feel completely fine. That seemingly random cup at an early appointment was doing more work than you realized.

How UTIs are treated during pregnancy

With antibiotics that are chosen specifically for pregnancy. Your provider is already thinking about which ones are appropriate in which trimester — that decision is theirs to make, and it is a routine one.

Two things matter on your end:

1. Finish the full course, even after the burning stops on day two. Stopping early is the most common reason an infection comes back.
2. Expect a follow-up culture. Many providers re-test after treatment to confirm the infection actually cleared, especially in pregnancy.

If you develop a kidney infection, treatment is more involved and sometimes involves a short hospital stay for IV antibiotics and fluids. That sounds alarming written down; in practice it is a known, well-handled situation, and it is far less likely if a bladder infection gets treated early.

Can a UTI affect your pregnancy or your baby?

An untreated infection that reaches the kidneys is associated with preterm labor and low birth weight. That is the honest reason providers do not take a wait-and-see approach.

But notice what that sentence hinges on: untreated, and reaching the kidneys. A bladder infection caught and treated is not the same story. This is a situation where early action removes almost all of the risk — which is a much better position than most pregnancy worries put you in.

Practical ways to reduce your risk

None of these are guarantees, and getting a UTI is not a hygiene failure. They simply reduce the odds:

• Do not hold it. Go when you feel it, even for the fourth time in an hour.
• Empty completely. Lean forward slightly and give it an extra moment.
• Urinate after sex, every time.
• Wipe front to back.
• Drink water steadily through the day rather than in two large gulps.
• Choose breathable cotton underwear and skip anything scented near the vulva — no douches, no scented wipes, no bubble bath.

If you find yourself needing water reminders, pairing them with something you already do daily helps more than willpower. Our guide to a healthy diet for pregnant mothers has a simple way to spread fluids across the day.

When to call your doctor or midwife

Call the same day if you have burning, urgency, bladder pain, unusual odor, or any blood in your urine.

Call urgently, or go be seen, if you have:

• Fever or chills
• Pain in your back or side, below the ribs
• Nausea or vomiting alongside urinary symptoms
• Contractions or cramping that come with any of the above

Those are the kidney-infection signals, and they are the ones that should not wait.

Frequently asked questions

Can I tell from the color of my urine? Not reliably. Prenatal vitamins alone can change the color. Trust symptoms — burning, urgency, pain, odor — over the color of the toilet bowl.

Should I drink cranberry juice? Cranberry juice is not a treatment for an established bacterial infection. Enjoy it if you like it, but do not use it as a reason to delay a phone call.

Why did my OB test my urine when I had no symptoms? They were screening for asymptomatic bacteriuria. Pregnant women can carry significant bacteria with no sensation at all, which is why a culture early in prenatal care is standard.

Can a UTI cause contractions? Infection can irritate the uterus, and a kidney infection in particular is associated with preterm labor. Cramping alongside urinary symptoms is a reason to be seen.

Notice the change and make the call

Pregnancy makes you incredibly aware of your body. Sometimes too aware. You notice every ache, every pressure, every bathroom trip you would have ignored a year ago.

That awareness is useful here. You do not need to memorize lab values or decide whether bacteria have reached your kidneys. You only need to notice when your urinary pattern changes. Frequent urination without discomfort may simply be pregnancy. Burning, pain, unusual urgency, or blood deserves a call. Fever, chills, vomiting, or flank pain deserves prompt evaluation. And sometimes there are no symptoms at all — which is exactly why your team screens your urine early.

The larger takeaway is a reassuring one: UTIs in pregnancy are common, recognizable, and treatable. The goal is not anxiety every time your bladder feels different. It is knowing enough that you do not have to guess.

Notice the change. Make the call. Let the urine test answer the question, and let your care team take it from there.