Braxton Hicks contractions can start as early as 6 to 12 weeks into pregnancy, but they are most commonly felt starting in the second or third trimester, especially after week 20 of pregnancy. These contractions are irregular, usually mild, and feel like a tightening or practice tightening of the uterus. They do not become progressively stronger or occur at regular intervals like true labor contractions.
In summary, Braxton Hicks contractions can begin in early pregnancy but are typically noticed later, usually from the second trimester onward.
