What are Braxton Hicks contractions?
Some time towards the middle of your pregnancy, or maybe even earlier, you may notice the muscles of your uterus (womb) tightening. If you place your hands on your bare bump when this is happening, you can feel how hard your uterus becomes.
Each tightening usually lasts for about half a minute, and probably won't cause you any discomfort. You may have this sensation once or twice an hour, a few times a day (Cheng and Caughey 2009). Not all of us feel these contractions. They get their name from John Braxton Hicks, the English doctor who first described them in 1872.
You may be aware of Braxton Hicks contractions from as early as 16 weeks (Shepherd et al 2004:238). However, without you realising, your uterus has been contracting gently on and off since about seven weeks (Murray and Hassall 2009:191). The bigger your uterus gets, the more you notice the tightening sensations when they happen.
HTH