Braxton Hicks contractions technically begin around 6 weeks of pregnancy, but you won’t feel them that early. Most people first notice them in the third trimester, though some become aware of them as early as the second trimester, around weeks 16 to 20. They’re completely normal and not a sign that labor is starting.
When They Actually Start vs. When You Feel Them
Your uterus begins producing these mild, irregular contractions very early in pregnancy, around 6 weeks gestation. At that point, your uterus is still small and the contractions are too faint to register. As the uterus grows and the muscle wall gets thicker, those same contractions become strong enough for you to notice.
For most people, that awareness kicks in sometime in the third trimester, roughly from week 28 onward. A smaller number of people start feeling them in the second trimester. First-time pregnancies and subsequent pregnancies can differ here. If you’ve been pregnant before, you may recognize the sensation earlier simply because you know what to pay attention to. Some people never consciously notice Braxton Hicks at all, and that’s also normal.
What They Feel Like
Braxton Hicks typically feel like a tightening or squeezing across the front of your belly. Your abdomen may feel noticeably hard to the touch for 30 seconds to two minutes, then soften again. They tend to be uncomfortable rather than painful, though intensity varies from person to person and can increase in the final weeks of pregnancy.
Unlike true labor contractions, Braxton Hicks are irregular. They don’t follow a predictable pattern, and they don’t get progressively closer together or stronger over time. They often come and go with no rhythm, and changing your position or activity level can make them stop entirely.
Common Triggers
Braxton Hicks don’t always appear randomly. Several everyday situations make them more likely:
- Dehydration. Even mild dehydration can trigger a round of contractions. Drinking a glass or two of water often settles them within minutes.
- Physical activity. Exercise, lifting, or even a long stretch of being on your feet can bring them on.
- A full bladder. Pressure from a full bladder against the uterus is a surprisingly common cause.
- Sexual activity. Orgasm causes uterine muscle contractions on its own, which can set off a round of Braxton Hicks afterward.
- Someone touching your belly. External pressure, including the baby’s own movement, can sometimes prompt a tightening response.
Knowing your triggers helps because the simplest relief strategies map directly to them: drink water, empty your bladder, sit or lie down, and change positions. If you’ve been sedentary for a long time, a short walk can also help. The contractions typically fade within a few minutes once the trigger is removed.
How They Change as Pregnancy Progresses
In the second trimester, Braxton Hicks tend to be infrequent and easy to dismiss. You might notice one or two a day, or go days without feeling any. By the third trimester, they often become more frequent and slightly more intense. In the last few weeks before your due date, some people experience them several times an hour, which can feel alarming but is still within the range of normal as long as they stay irregular.
This late-pregnancy uptick serves a purpose. Braxton Hicks help tone the uterine muscle, essentially conditioning it for the work of labor. They also play a role in softening and thinning the cervix in the weeks leading up to delivery. Think of them as your body’s rehearsal for the real event.
Braxton Hicks vs. True Labor Contractions
The key distinction is pattern. True labor contractions get stronger, last longer, and come at increasingly regular intervals. Braxton Hicks do none of those things. Here’s a practical way to tell them apart:
- Regularity. True labor contractions follow a rhythm you can time. Braxton Hicks are scattered and unpredictable.
- Progression. Real contractions intensify over hours. Braxton Hicks stay roughly the same or fade away.
- Location. Labor pain often starts in the lower back and wraps around to the front. Braxton Hicks are usually felt only across the front of the abdomen.
- Response to movement. Changing your position, walking, or resting often stops Braxton Hicks. True contractions continue regardless of what you do.
If you’re unsure, try timing the contractions for an hour. Braxton Hicks will space out unevenly and eventually stop. Labor contractions will maintain or shorten their intervals.
When Contractions Need Attention
Before 37 weeks, contractions that come at regular intervals or don’t stop with rest and hydration could be a sign of preterm labor. Other warning signs include pain in your lower back that doesn’t go away when you change positions, a bloody or mucus-like discharge, or fluid leaking from your vagina. If any of these occur before 37 weeks, contact your provider promptly. Early intervention for preterm labor makes a significant difference in outcomes.
After 37 weeks, the same signs simply mean labor may be beginning. At that point, timing your contractions and following your provider’s guidance on when to head to the hospital is the right next step.