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Labor & postpartum Medical emergency

Premature rupture of membranes

Also known as PROM, PPROM, Water breaking early, Prelabor rupture of membranes. Term (at or after 37 weeks) or preterm (before 37 weeks).

Your water breaking before labor starts is premature rupture of membranes. At term, at or after 37 weeks, it is common and usually means labor is about to begin. Before 37 weeks it is called preterm premature rupture of membranes, or PPROM, and it is more serious: the baby may come early, and there is a real risk of infection. Either way, the safest move is the same, contact your provider or go to your delivery facility promptly, because rupture starts a clock you cannot read at home.

Know the warning signs When to call a provider
How common
Term ~8% to 10%
Preterm PROM affects about 3% of pregnancies and causes roughly a third of preterm births.
When
Before labor begins
At term (37 weeks or later) or preterm (before 37 weeks); the timing drives everything.
Urgency
Go in promptly
Any suspected water breaking should be evaluated right away, more urgently the earlier it is.
Outlook
Depends on timing
At term, usually straightforward; preterm needs careful management.

This can be a medical emergency. Any suspected water breaking, especially before 37 weeks: contact your provider or go in right away If this happens, go to the ER or call 911 right away.

Understanding it

What is premature rupture of membranes?

Your baby grows inside a fluid-filled sac of membranes. Normally these rupture, your water breaks, during labor. When they break beforehand, that is premature rupture of membranes, and everything about what happens next turns on timing.

At term, at or after 37 weeks, rupture is common and generally reassuring, a sign labor is about to begin. Most people go into labor on their own within a day, and the plan is simply to move toward delivery, with antibiotics in labor if you carry group B strep or if birth does not come quickly, since the longer the gap between rupture and birth, the higher the infection risk.

Before 37 weeks, called preterm premature rupture of membranes or PPROM, it is more serious. It accounts for about a third of all premature births and brings the risks of prematurity plus real risk of infection inside the uterus, often the same infection or inflammation that triggered the rupture. Here the goal shifts: depending on how early it is, the team may work to safely prolong the pregnancy, buying the baby time to mature, while watching closely for infection.

Whatever the week, the action is the same: go to labor and delivery promptly. Do not wait to see what happens, especially if you are preterm, if the fluid is green or foul-smelling, or if you feel something in the vagina. Quick evaluation keeps you and your baby safe.

Symptoms

What are the symptoms?

The symptom is fluid leaking from the vagina, a dramatic gush or a slow trickle. Telling amniotic fluid from urine can be tricky, which is one reason to be checked.

Early signs

  • A gush of fluid from the vagina, or a slow, continuous or intermittent trickle
  • Fluid that is usually clear or pale yellow and, unlike urine, odorless or sweet-smelling
  • Persistent wetness you cannot control, unlike occasional urine leakage
  • Sometimes uncertainty about whether it is your water or urine, which is normal

Emergency signs — call 911

  • Any suspected water breaking, especially before 37 weeks: contact your provider or go in right away
  • Green, brown, or foul-smelling fluid, which can signal infection or the baby passing stool
  • Fever, chills, or a tender, painful uterus, signs of infection inside the womb
  • Feeling something in the vagina, or a loop of cord, which is an emergency (cord prolapse)
  • Heavy vaginal bleeding, or regular contractions before 37 weeks

Why it matters

Risks to you and baby

Infection inside the uterus

Once the membranes are open, bacteria can travel up and infect the fluid and womb (chorioamnionitis). The risk grows the longer the gap before delivery, which is why timing and antibiotics matter, and why fever or foul-smelling fluid is an emergency.

Prematurity

When rupture is preterm, the main risk is an early birth, with the breathing, feeding, and other challenges of prematurity. Much of the management aims to safely buy the baby more time to mature.

Cord prolapse and compression

When the water breaks, especially if the baby is high or breech, the cord can slip down or be compressed, an emergency, and part of why any rupture is evaluated promptly.

Low fluid affecting the baby

As fluid leaks, the level around the baby can drop, which very early can affect lung development and later can compress the cord. The fluid level is watched on ultrasound.

How it's found

How is it diagnosed?

Rupture is confirmed with a sterile speculum exam and simple tests on the fluid, sometimes a specialized swab, plus ultrasound to check the fluid around the baby.

Sterile speculum exam

Your provider looks for amniotic fluid pooling in the vagina, the most direct sign of rupture, and assesses the cervix. Digital exams are minimized to reduce infection risk.

Fluid tests (pH and ferning)

Amniotic fluid is alkaline and turns pH paper blue, and dried on a slide it forms a fern-like pattern under the microscope. Together these confirm rupture in most cases.

Specialized swab and ultrasound

When results are unclear, a swab for amniotic-fluid proteins is highly accurate, and ultrasound checks how much fluid remains around the baby.

Whenever you think your water may have broken. Prompt evaluation confirms rupture, checks for infection, and sets the plan based on how far along you are.

Treatment

How is it managed?

Management hinges on gestational age. At term, the plan is to move toward delivery. Preterm, it balances prolonging the pregnancy against the risk of infection.

Treatment paths

At or after 37 weeks, the safest course is usually delivery, by inducing labor or, if needed, cesarean, since delivering sooner lowers infection risk; antibiotics are given in labor if you carry group B strep. Before 37 weeks, if there is no infection and the baby is stable, the team may use expectant management: prolonging the pregnancy under close watch to let the baby mature.

Medication

For preterm rupture, latency antibiotics help prolong the pregnancy and reduce infection, steroids mature the baby's lungs, and magnesium sulfate before about 32 weeks protects the brain. Group B strep antibiotics are given as indicated.

Can it recur?

Preterm rupture has a real chance of recurring, roughly 16% to 32% after a prior PPROM, versus about 4% for someone whose previous births were at term. So a history of it prompts closer monitoring and sometimes preventive measures next time.

What you can do

Can it be prevented?

  • There is no proven way to prevent it outright

    Premature rupture cannot be reliably prevented, but reducing the modifiable risk factors helps. The most important is not smoking, which weakens the membranes.

  • Treat infections

    Because infection can trigger preterm rupture, having genital and urinary infections like bacterial vaginosis and UTIs checked and treated is a sensible step.

  • Report a short cervix or prior preterm birth

    If you have had a preterm birth or preterm rupture before, or have a short cervix, tell your provider, so closer monitoring and sometimes preventive treatment can be arranged.

  • Know what to do when your water breaks

    The best preparation is knowing to contact your provider or go in promptly, and to note the time, color, and smell of the fluid, which helps guide your care.

Who is more at risk

Risk factors

A prior preterm rupture
Having had preterm rupture before is the strongest risk factor for it recurring.
Recurrence of 16% to 32%, versus about 4% after only term births.
A short cervix
A shortened cervix, often found on ultrasound, is linked to both preterm rupture and preterm birth.
Infection
Genital and urinary infections, including bacterial vaginosis and untreated UTIs, can trigger preterm rupture, which is why they are treated.
An overstretched uterus
Carrying twins or too much amniotic fluid stretches the membranes and raises the risk of rupture.
Smoking and bleeding
Smoking weakens the membranes, and second- or third-trimester bleeding is linked to a higher risk of rupture.

Do not wait

When to call your provider or 911

  • Contact your provider or go to your delivery facility right away if you think your water has broken, especially before 37 weeks.
  • Seek emergency care for green, brown, or foul-smelling fluid, which can signal infection.
  • Go in urgently for fever, chills, or a tender, painful uterus, which are signs of infection in the womb.
  • Call 911 or go in immediately if you feel something in your vagina, which could be a prolapsed cord.
  • Seek care for heavy bleeding, or for regular contractions before 37 weeks.

Talking to your team

Questions to ask your provider

  • How can you tell if my water has really broken?
  • How far along am I, and does that change the plan?
  • If I am preterm, will you try to delay delivery, and how?
  • Will I need antibiotics or steroids, and why?
  • What signs of infection should I watch for?
  • Given this, am I at higher risk of preterm rupture next time?

Keep reading

More on premature rupture of membranes

All pregnancy guides articles

Good to Know

Premature rupture of membranes FAQs

Common questions about premature rupture of membranes, answered.

How do I know if my water broke or if it is urine?

It can be hard to tell, which is reason enough to be checked rather than guess. Amniotic fluid is usually clear or pale, odorless or sweet-smelling, and keeps leaking in a way you cannot control; urine is yellow and smells like urine. If unsure, go in, where simple tests confirm it quickly.

My water broke at term. What happens now?

At or after 37 weeks, it usually means labor is imminent, and most people start on their own within a day. The plan is to move toward delivery, inducing if labor does not begin soon, because delivering sooner lowers infection risk. You will get antibiotics in labor if you carry group B strep. Go in so care can begin.

What does it mean if my water breaks before 37 weeks?

That is preterm premature rupture of membranes, or PPROM, and it is more serious: it can lead to an early birth and carries a risk of infection. Depending on how early it is, your team may work to safely prolong the pregnancy with antibiotics and steroids, watching closely for infection.

Can labor be stopped if my water breaks early?

Not stopped, but often delayed when it is safe. If there is no infection and your baby is stable, the team may use expectant management, latency antibiotics, and steroids to buy time for the baby to mature. If infection or other problems develop, delivery becomes the safer choice.

Will my baby be okay if my water breaks early?

It depends heavily on how early. The main risks are prematurity and infection, and modern management, antibiotics, steroids for the lungs, magnesium for the brain when very early, and close monitoring, substantially improves outcomes. The team will guide you through the specifics for your gestational age.

Why do I need antibiotics if there is no infection yet?

For preterm rupture, they do two things: help prolong the pregnancy and lower the chance of infection developing, both of which benefit your baby. Separately, if you carry group B strep, antibiotics in labor protect against that specific infection.

Should I still go in if the leaking stopped?

Yes. Even if the leaking seems to stop, get checked, because the membranes may still be ruptured and the risks of infection and, if preterm, prematurity remain. Do not assume it was nothing. A quick assessment confirms whether your water broke and guides what is next.

Will this happen again next time?

If you had preterm rupture, the chance of recurrence is meaningfully higher, roughly 16% to 32%, versus about 4% for someone whose prior births were at term. So your next pregnancy would be monitored more closely, and preventive measures may be discussed.

Medically Reviewed · Updated

Reviewed by Dr. Grace Lin, MD, FACOG · OB-GYN

Obstetrician-gynecologist focused on reproductive and sexual health for women: pregnancy, BV, yeast, trichomoniasis and HPV/cervical screening. Our editorial guidelines →

6 Sources

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