Signs of Labor: How to Tell Real Contractions From a False Alarm

At some point in the last few weeks of pregnancy, you will feel something and think: is this it? Maybe it is a tightening across your belly that shows up three times in an hour and then vanishes. Maybe it is a dull backache that will not quit. Either way you are standing in the kitchen at 11 p.m. holding your phone, trying to decide whether to wake anyone up.

This page is the short, plain version of what medical sources actually say about the signs of labor: what true contractions do that false ones do not, the timing rule most providers use to decide when you should come in, and the handful of symptoms that mean you call now and skip the timing entirely. Everything here traces to a source you can click and read yourself.

01When labor usually starts

First, the window. According to the NICHD, part of the National Institutes of Health, "For most women, labor begins sometime between week 37 and week 42 of pregnancy." Labor that starts before 37 weeks is called preterm or premature labor, which has its own set of warning signs further down this page.

That is a five-week window, which is not the tidy answer anyone wants. Your due date is a midpoint, not an appointment. The NICHD also notes that unless there is a medical reason to deliver sooner, waiting until at least 39 weeks gives "mother and baby the best chance for healthy outcomes" — so a pregnancy that runs past the date on the calendar is usually doing exactly what it should.

02The signs that labor is starting

The headline sign is contractions. The NICHD describes it as "a series of contractions (tightening and relaxing of the uterus) that arrive regularly" — and the important part is what they do over time: they get stronger, last longer, and come more often. A contraction that shows up once and never returns is not the start of anything.

Alongside the contractions, the same source and the Office on Women's Health list several other signs that labor is near or underway.

• Contractions with a pattern. The Office on Women's Health puts it simply: "You have contractions that become stronger at regular and increasingly shorter intervals."
• Low back pain and cramping that will not go away. Not the ache that shifts when you shift — the one that stays. The NICHD also lists "menstrual-like cramps with or without diarrhea."
• Lightening. The NICHD's term for the fetus moving lower in the uterus. Some people notice they can suddenly breathe more easily, and need the bathroom more often.
• The bloody show. A change in vaginal discharge that the NICHD describes as "clear, pink, or slightly bloody." The Office on Women's Health explains what it is: "a bloody (brownish or red-tinged) mucus discharge. This is probably the mucus plug that blocks the cervix."
• Pelvic pressure. Low back pain or a heavy feeling of pressure down low, per the NICHD.
• Your water breaking. MedlinePlus, the National Library of Medicine's consumer health site, describes it plainly: "When the amniotic sac (bag of fluid around the baby) breaks, you will feel fluid leak from your vagina. It may come out in a trickle or a gush." The Office on Women's Health says the same — "a large gush or a continuous trickle."

Notice what is not on that list: nesting. The burst of energy that has you scrubbing the baseboards is common late in pregnancy, but none of the sources we reviewed describe it as a reliable sign that labor is about to begin. We wrote about that in more detail in our guide to nesting during pregnancy.

03True labor vs. false labor

This is the part everyone actually wants. The NICHD is honest right up front: "It can be hard to tell the difference between Braxton Hicks contractions and true labor contractions." So nobody is failing a test here. But there are four differences worth knowing, and once you know them, most false alarms sort themselves out in about twenty minutes.

What false labor does

The NICHD defines it this way: "'False labor' refers to irregular contractions that sometimes happen before true labor begins. These contractions are also called Braxton Hicks contractions." Its description of them:

• "Contractions do not come regularly and do not get closer together."
• "Contractions may stop when the woman walks or rests, or they may stop when the woman changes position."
• "The woman usually feels pain only in the front."
• "Contractions are usually weak and do not get much stronger or they may start strong and get weaker."

MedlinePlus adds that false labor contractions "are typically short," "are not painful," "do not come at regular intervals," and "do not result in cervical changes that suggest the onset of true labor."

What true labor does

The NICHD's contrast is short and useful: "Contractions come at regular times and get closer together over time," and "Pain usually starts in the back and moves to the front." MedlinePlus is more specific about the numbers. True labor contractions:

• "Come regularly and get closer together (about 5 to 10 minutes apart)"
• "Last from 30 to 70 seconds, and will get longer"
• "Not stop, no matter what you do"
• "Radiate (reach) into your lower back and upper belly"

04How to time contractions

There is one detail people get wrong, and it changes the answer completely. The Office on Women's Health says to "use a watch or clock to keep track of the time one contraction starts to the time the next contraction starts, as well as how long each contraction lasts."

Start to start — not the end of one to the beginning of the next. So you are writing down two numbers each time: how far apart they are, and how long each one lasts. Any note app works. So does a scrap of paper on the counter, which has the advantage of being readable by whoever is driving.

05When to go to the hospital

The rule of thumb most providers give has a name, and it is worth memorizing because it is easy to recall at 3 a.m. MedlinePlus spells it out as the 4-1-1 guide: "Contractions are strong and coming every 4 minutes, they last 1 minute, and they have been ongoing for 1 hour."

Some providers ask you to call sooner. The NICHD says women having regular contractions every 5 to 10 minutes for an hour should let their health care provider know — a call, not necessarily a car ride. MedlinePlus lists the same threshold as a reason to contact your provider: "regular, painful contractions every 5 to 10 minutes for 60 minutes." This is exactly why the number your own provider gives you beats any number on a website, including this one. Ask them, and write the answer on the fridge.

06Signs of preterm labor, before 37 weeks

The Cleveland Clinic defines it as "labor that begins early — before 37 weeks of pregnancy," and its warning signs are a little different from the full-term list, because early contractions are often mild enough to be mistaken for gas or an ordinary backache.

• "Four or more contractions (or tightening and relaxing of the muscles in your uterus) in one hour"
• "Regular tightening or low, dull pain in your back"
• "Lower abdominal cramping that might feel like gas pain"
• "Increased pressure in your pelvis or vagina"
• "Leaking of fluid from your vagina"
• "Vaginal bleeding"
• "Decreased fetal movements (if you don't feel at least six movements in one hour)"

The Cleveland Clinic's instruction is to contact your provider right away if you have these symptoms and they do not go away within an hour, or if the pain is severe and persistent. Preterm labor is one of the few times in pregnancy where hours genuinely matter, so this is not a wait-and-see situation.

07What to do in the early hours at home

Assuming your provider has told you to stay put for now, the honest news is that this stretch can be long. MedlinePlus says the steps leading up to labor "can last for days" and advises: "When labor first begins, be patient and monitor your body."

Its suggestions for the wait are refreshingly ordinary: "Use your time at home to take showers or warm baths and pack your bag if you have not packed yet," and "walk around the house or sit in your baby's room until it is time to go to the hospital." The Office on Women's Health agrees that most people spend the early part of the first stage at home: "You might want to rest, watch TV, hang out with family, or even go for a walk."

Two practical notes on that. If the bag genuinely is not packed, our hospital bag list is the fastest version — it covers what is worth bringing and what the hospital already has, so you are not throwing random things into a duffel between contractions. And if you are reading this well before the day, packing it early is one of the easiest items on the third trimester checklist to knock out from a chair.

08The part nobody warns you about: false alarms are normal

Plenty of people time contractions for an hour, decide this is it, and then watch the whole thing fizzle by morning. That is not a mistake — it is literally what the medical sources describe false labor doing. Contractions that stop when you change position, that stay only in the front, that start strong and get weaker: all of that is the NICHD's own description of a body rehearsing, not failing.

And going in and being sent home is not a failure either. It is a normal outcome of a system where the only way to know for certain, sometimes, is a cervical exam. Nobody is keeping score. The two things worth doing in advance are knowing your provider's number without looking for it, and knowing which symptoms skip the timing entirely — which is the checklist above.

09After the drive, the other learning curve starts

Labor gets all the attention in the last trimester, and then it is over in a day and the actual job begins. If you want to spend an evening of the waiting on something useful, our guide to what to expect in the first week with a newborn covers what the first days home really look like — feeding, sleep, diapers, and when to call the pediatrician, each one sourced the same way this page is.

Questions parents actually ask

Newborn Weeks is planning help, not medical advice — always follow your own doctor, midwife, or pediatrician.