PIEZO1 transcripts in human uterine muscle at term. Green indicates smooth muscle fibers in the uterus, red marks PIEZO1 mRNA, and blue shows cell nuclei. LA JOLLA, CA—When labor begins, the uterus ...

Braxton Hicks contractions are uterine contractions that start in early pregnancy. Most don't notice them until sometime in the second or third trimester – and some women never notice them at all.

Contractions are a sign that your body is getting ready for one of the biggest moments of your life. You might be asking yourself what they will feel like or how you will handle them when they start.