Preterm Labor: Warning Signs, What It Means, and When to Call
Preterm labor means labor that starts before 37 weeks of pregnancy. Preterm birth is a birth that happens between 20 weeks and 36 weeks 6 days. It matters because babies born too early can have more trouble with breathing, feeding, temperature control, infection, and other complications.
The good news is that not every contraction means preterm labor. That is one of the reasons evaluation matters.
What is preterm labor?
Preterm labor is usually diagnosed when there are regular contractions plus cervical change. It may also be diagnosed when someone presents with regular contractions and the cervix is already dilated to at least 2 cm.
That distinction is important. Many pregnant patients have contractions, tightening, pelvic pressure, or discomfort at times. Those symptoms can absolutely get your attention, but they do not always mean true labor is happening.
Why does it matter?
Preterm birth is one of the most important causes of serious newborn complications. Babies who are born too early are at higher risk for breathing problems, bleeding in the brain, intestinal problems, infection, and longer hospital stays. In general, the earlier a baby is born, the higher the risk tends to be.
This is exactly why we take possible preterm labor seriously. The goal is to recognize the patients who are truly at risk and, when appropriate, give treatment that may improve outcomes for the baby.
What are the warning signs?
Possible signs of preterm labor can include:
regular contractions
tightening or cramping that keeps coming back
pelvic pressure
low back pain
menstrual-like cramps
a change in vaginal discharge
leaking fluid
vaginal bleeding or spotting
Some of these symptoms can happen in normal pregnancy too, which is why the pattern matters so much. If symptoms are becoming regular, stronger, more painful, or are associated with bleeding or leaking fluid, you should call. Unfortunately, Google cannot check your cervix. If something feels off, call us.
Does every contraction mean preterm labor?
No.
It is completely normal to have contractions throughout pregnancy, and they usually get more noticeable as pregnancy goes along. Hopefully, at some point, they actually do their job and turn into labor. But before that glorious day, plenty of contractions are just your uterus reminding you that it has opinions.
That is why we do not panic over every tightening or cramp. Some patients have contractions, pressure, back pain, and all kinds of suspicious nonsense and still do not go on to deliver anytime soon.
What matters most is the overall picture, especially whether the cervix is actually changing.
How is preterm labor diagnosed?
Diagnosis usually depends on the clinical picture. We are often looking at:
whether contractions are regular
whether the cervix is changing
whether there is cervical dilation or effacement
whether there is bleeding or leaking fluid
how far along the pregnancy is
In some situations, additional testing such as cervical length measurement or fetal fibronectin may be used to help estimate risk. But these tests are not perfect, and a positive fetal fibronectin or a short cervix alone should not be used by itself to make every management decision.
What happens if preterm labor is suspected?
That depends on the gestational age, the symptoms, the cervical exam, and the overall clinical picture.
The main point patients should understand is this: when we intervene, it is usually because there may be benefit to the baby from gaining a little more time. In many cases, treatment is aimed at buying enough time for things like:
steroid shots to help the baby’s lungs and other organs mature
magnesium sulfate in certain earlier pregnancies to help protect the baby’s brain
transfer to a higher level of care if needed
Medications used to slow contractions, called tocolytics, may sometimes be used for short-term pregnancy prolongation, but they are generally meant to buy time, not to permanently stop labor. In some cases, they may buy enough time for other important treatments to help.
Will everyone with preterm contractions be treated?
No.
Patients with contractions without cervical change, especially if the cervix is less than 2 cm dilated, generally are not treated with tocolytics.
This is important because more treatment is not always better. The right care depends on whether true preterm labor appears to be happening.
Are bed rest and hydration the answer?
Usually, no.
This is a common area of confusion. Bed rest and hydration have not been shown to reliably prevent preterm birthand are not routinely recommended as treatment for true preterm labor. Bed rest can also have downsides, including deconditioning and blood clot risk.
That does not mean hydration never matters. It means drinking water and lying down should not be thought of as reliable treatment for true preterm labor.
What about antibiotics?
Antibiotics are not used to prolong pregnancy in patients with preterm labor and intact membranes. They have not been shown to improve outcomes in that situation and are not used for that purpose.
That is different from other situations, like certain infections, group B strep management, or ruptured membranes, where antibiotics may absolutely be appropriate.
When should I call Calhoun Women’s Center?
Please call us if you are having:
regular contractions
tightening that keeps coming back
new pelvic pressure
persistent low back pain or cramping
spotting
a change in discharge that concerns you
concern that you may be leaking fluid
symptoms that feel different from usual
You do not need to figure out by yourself whether it is “real labor.” That is part of what we are here for.
When should I seek urgent care right away?
Please seek urgent evaluation right away if:
you think your water may have broken
you are having vaginal bleeding
contractions are becoming regular and painful
you have severe abdominal pain
you notice decreased fetal movement
you feel like something is clearly wrong
you are having signs of preeclampsia or another serious pregnancy problem
In general, if you are worried you may be in preterm labor, especially with bleeding, leaking fluid, or worsening contractions, you should be evaluated.
Final thoughts
Preterm labor is important, but it is also often misunderstood. Many patients have contractions and do not go on to deliver early. The key is recognizing symptoms that deserve evaluation and identifying the patients who may actually benefit from treatment.
If you are having symptoms that worry you, call. We would much rather talk through it early than have you sit at home wondering.
Professional reference
ACOG Practice Bulletin No. 171: Management of Preterm Labor
