Preterm Labour: The Signs Every Pregnant Woman Should Know

Find out what causes preterm labor, how to tell if you're having it, and what will happen if you are.

Most pregnancies run their full course, but roughly one in eight babies arrives early, before 37 weeks, and preterm labour can begin without much warning. It’s one of those topics that’s easy to avoid thinking about, right up until you need it. Knowing the signs, and what to do, can truly change the outcome, because acting fast gives doctors the best chance to help. Here’s what preterm labour is, how to spot it, and what happens next.

Preterm labour is labour that starts before 37 weeks. It can’t always be predicted or prevented, but recognising the signs early matters enormously. If you notice regular tightening, low backache, pelvic pressure, a change or gush of fluid, or bleeding before 37 weeks, contact your hospital or doctor immediately. Fast action lets doctors give treatments that protect your baby.

When in doubt before 37 weeks, call. It’s always better to be checked and reassured than to wait and wonder.

What preterm labour is

A baby is considered full term from 37 weeks. Labour that begins before then is preterm, and babies born early can need extra help, because their lungs, feeding and temperature control may not be fully ready, sometimes meaning time in a special care or neonatal unit. Preterm birth is more common than many people realise, affecting around one in eight pregnancies, and while about half of women who go into preterm labour don’t go on to have serious complications, it’s not something to wait out at home. Many causes exist, from carrying twins or more, to infections, to certain maternal health conditions, and often no clear cause is found at all, which is precisely why it can catch anyone.

The signs to know

Preterm labour can feel different from the dramatic version in films. Watch for these before 37 weeks:

Regular tightening or contractions, which may or may not hurt, coming in a pattern rather than the odd random tightening.
A low, dull backache that comes and goes, or constant low back pain.
Pelvic or bottom pressure, a feeling that the baby is pushing down.
Period-like cramping or belly cramps, sometimes with diarrhoea.
A change in vaginal discharge, especially if it becomes watery, mucus-like, or blood-tinged.
A gush or trickle of fluid, which can mean your waters have broken.
Any vaginal bleeding.

These can overlap with the ordinary aches of late pregnancy and that is why the timing matters: the same sensations before 37 weeks, particularly if they’re new, regular or intensifying, deserve a call.

What to do

If you notice any of these signs before 37 weeks, don’t try to decide at home whether it “counts”. Contact your hospital’s delivery suite or your doctor straight away and describe what’s happening. They may ask you to come in to be assessed, checking your cervix, monitoring the baby and your contractions, and testing for signs that labour is truly starting. Time is the crucial factor: if preterm labour is confirmed or likely, doctors have treatments that make a real difference, including medicines to help mature your baby’s lungs and, in some cases, medicines to slow contractions to buy time or to allow transfer to a hospital with the right neonatal facilities. None of that can happen if you wait it out, so early contact is the single most useful thing you can do.

Can you lower the risk?

Preterm labour often can’t be prevented, but a few things support a healthy, full-term pregnancy: attending your antenatal appointments so problems are spotted early, treating infections promptly (including urinary infections, which can trigger it), not smoking, and telling your doctor if you’ve had a preterm birth before, since they may offer extra monitoring or measures. If you have a known higher risk, your care team will guide you. For everyone else, knowing the signs is the practical protection, because recognising them early is what turns a frightening situation into a manageable one.

If you are ever unsure whether what you are feeling counts, err on the side of calling. Maternity units would far rather check a false alarm than miss the real thing, and no one will think you are wasting their time.

Common questions

What is preterm labour?

Labour that starts before 37 weeks of pregnancy. Babies born early may need extra help, sometimes in a neonatal unit, because they aren’t fully ready. It affects around one in eight pregnancies.

What are the signs of preterm labour?

Regular tightening or contractions, a low backache, pelvic or bottom pressure, period-like cramps, a change or gush of vaginal fluid, or any bleeding, occurring before 37 weeks. New, regular or intensifying symptoms are the ones to act on.

What should I do if I think I’m in preterm labour?

Contact your hospital’s delivery suite or your doctor immediately and describe your symptoms. Don’t wait to see if they pass. Early assessment lets doctors give treatments, like lung-maturing medicine, that protect your baby.

Can preterm labour be stopped?

Sometimes contractions can be slowed with medicine to buy time or allow transfer to a hospital with the right facilities, and lung-maturing steroids can help the baby. It can’t always be stopped, but early treatment improves outcomes.

Can I prevent preterm birth?

Not always, as often there’s no clear cause. You can support a healthy pregnancy by attending antenatal care, treating infections promptly, not smoking, and telling your doctor if you’ve had a preterm birth before so they can monitor you more closely.

The short version

Preterm labour is more common than expected and can start quietly, so the best protection is simply knowing the signs: regular tightening, low backache, pelvic pressure, cramping, a change or gush of fluid, or any bleeding before 37 weeks. If any of those show up, call your hospital or doctor at once rather than waiting. Acting early gives your baby the full benefit of the treatments modern maternity care can offer, and turns a scary moment into one the professionals can take from there.