Braxton Hicks contractions can start as early as around 6 to 12 weeks of pregnancy, but they are most commonly noticed in the second or third trimester. They tend to become more frequent and noticeable as pregnancy progresses, especially in the third trimester starting around week 20 to 32. These contractions are irregular, usually short-lasting (typically 15 to 30 seconds), and often described as a tightening or mild cramping in the abdomen. They are not usually painful and serve as practice contractions to prepare the uterus for labor. Triggers can include physical activity, dehydration, a full bladder, or sexual intercourse, but they do not signal actual labor unless they become regular, painful, and intensify over time.
