Usually in the third trimester you will begin to feel Braxton Hicks contractions.  These contractions result in a tightening of your uterus.  Braxton Hicks contractions can be mild to uncomfortable.  Your stomach will become tight and hard for about twenty-five seconds. 

The major difference between Braxton Hicks contractions and labor contractions are that the Braxton Hicks do not result in your cervix dilating.  They do not begin labor, and they are not at regular intervals.  Braxton Hicks contractions increase circulation of blood to the placenta, and prepare your body for true labor.

Interestingly, once you have experienced full labor contractions, you understand the difference between these and Braxton Hicks. Of course, this does not help the first time mother who is wondering if she is in labor or not. Again, look for regular contractions for the beginning of labor. Braxton Hicks are exciting, sometimes painful and are certainly preparing your body for labor - but are not at the intensity of regular childbirth contractions.

If you are experiencing Braxton Hicks contractions, be sure you are hydrated and take a break.  Lie down or sit when the Braxton Hicks contractions become uncomfortable.  You can use these moments to practice your breathing techniques while waiting for the real thing!