Braxton-Hicks contractions are sometimes referred to as practice contractions. While they can happen in the second trimester, they are far more common in the third. During Braxton-Hicks, the uterus tightens for 30 seconds to two minutes. These contractions are not indicative of labor. Women describe them as irregular in intensity and occurrence, non-rhythmic, and unpredictable. Braxton-Hicks do not increase in intensity like labor contractions, and stop and start irregularly.
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