Practice contractions, known as Braxton Hicks contractions, can begin as early as the second trimester, around week 20 of pregnancy. Most women start noticing them somewhere between weeks 28 and 30, well into the third trimester. Some women feel them often, others rarely or not at all, and both are perfectly normal.
When They Typically Start
The uterus actually begins contracting in small ways early in pregnancy, but these squeezes are too faint to feel. By the middle of the second trimester, some women start to notice a periodic tightening across the belly that comes and goes without any real pattern. For first-time mothers especially, these sensations often go unrecognized until later in the third trimester, when the contractions become more obvious.
As you move closer to your due date, Braxton Hicks tend to happen more frequently and feel more intense. In the final weeks of pregnancy, it’s common to have several in a single day, particularly during active afternoons or evenings. This increase in frequency is normal and does not mean labor is starting.
What They Feel Like
A Braxton Hicks contraction typically feels like a squeezing or tightening across the front of your abdomen. Your belly may feel unusually hard to the touch for 30 seconds to about two minutes, then soften again. The sensation is usually more uncomfortable than painful, though it can catch you off guard if you’re not expecting it.
The key feature is irregularity. Practice contractions don’t settle into a rhythm. You might feel two in an hour, then nothing for the rest of the day. They also tend to stay in the front of the abdomen rather than radiating to the lower back, and they generally ease up if you change position, lie down, or drink water.
Why They Happen
Braxton Hicks contractions serve a few purposes. They help tone the uterine muscle, essentially giving it a workout so it’s ready for the sustained effort of labor. They also play a role in blood flow: when the uterine muscle contracts, it pushes oxygen-rich blood toward the placenta and into the baby’s circulation. Over time, these contractions may help soften the cervix, though they do not cause the cervix to dilate.
Common Triggers
Certain situations make Braxton Hicks more likely to show up:
- Dehydration. Even mild dehydration is one of the most common triggers.
- Physical activity. Being on your feet a lot, exercising, or lifting something heavy can set them off.
- A full bladder. The pressure of a full bladder against the uterus can prompt a contraction.
- Sex. Orgasm and physical stimulation can both trigger tightening.
The thread connecting most of these triggers is that they create a moment of mild physical stress, which prompts the uterus to contract and push more blood to the placenta. Addressing the trigger, whether that means drinking a glass of water or sitting down for a few minutes, usually resolves the contractions quickly.
How to Tell Them Apart From Real Labor
The distinction matters most before 37 weeks, when regular contractions could signal preterm labor. Here’s how practice contractions differ from the real thing:
- Pattern. Braxton Hicks are irregular and unpredictable. True labor contractions come at increasingly regular intervals and get closer together over time.
- Intensity. Practice contractions stay about the same strength or fade. Labor contractions build, getting longer and stronger with each one.
- Location. Braxton Hicks are usually felt in the front of the belly. Labor contractions often start in the back and wrap around to the front.
- Response to rest. Changing positions, walking, or drinking water will typically quiet Braxton Hicks. Labor contractions keep coming regardless of what you do.
A useful benchmark: if you’re having contractions every five minutes for at least one hour, that pattern is consistent with early labor rather than practice contractions.
How to Get Relief
Because Braxton Hicks are harmless, the goal is simply comfort. Drinking a full glass of water is the simplest first step, since dehydration is such a reliable trigger. If you’ve been active, sitting or lying down on your left side often helps. Emptying your bladder can also make a noticeable difference. A warm bath or slow breathing exercises work for some women when the tightening feels particularly uncomfortable.
If changing your activity and hydrating don’t settle things down within an hour, or if the contractions start falling into a regular pattern, that’s worth a call to your provider, especially before 37 weeks. Contractions that come with vaginal bleeding, fluid leaking, or consistent low back pain are a separate situation and shouldn’t be written off as Braxton Hicks.