There are two different kinds of contractions. Braxton-Hicks contractions, also called false labor, prepare your body for labor and delivery. Labor contractions signal the beginning of childbirth.
Causes of contractions
Braxton-Hicks (false labor)
These contractions soften and thin the cervix (the opening to the uterus through which the baby passes during delivery). The contractions tend to increase in the weeks right before your due date. With Braxton-Hicks:
Most pregnancies generally last between 37-42 weeks. (Your due date is calculated as 40 weeks after the first day of your last menstrual period.) Labor contractions signal the beginning of childbirth. These contractions come at regular intervals, usually move from the back to the lower abdomen, last between 30-70 seconds, and get stronger and closer together over time. For some women, there is no advance sign that labor is near. Others experience cramps, contractions and discomfort for weeks before delivery.
Nobody knows exactly what causes labor to begin, but the following signs may help signal that labor is near:
Painful, regular contractions before the 37th week of pregnancy may be a sign of preterm labor. Preterm labor occurs in about 1 of 8 births in the United States. Compared to babies born after the 37th week, preterm babies are at greater risk of:
Preterm labor can happen to any woman. There is no single cause of preterm labor. Learn more about preterm labor.
What you can do
Towards the end of your pregnancy, you may have regular contractions that don't immediately lead to changes in your cervix or progress to labor. If you go to the hospital only to find out that you are having false labor, don't feel bad about it. It’s sometimes hard to know the difference between real and false labor. To tell if labor has begun, your health care provider must examine your cervix.
When you first feel contractions, time them. Write down how much time passes from the start of one contraction to the next. Make a note of how strong the contractions feel. Keep a record of your contractions for an hour. Walk or move around to see whether the contractions stop when you change positions.
You are probably experiencing false labor if:
When to talk to your health care provider
Contact your health care provider right away if you are having contractions that trouble you, especially if they become very painful or if you think you are having preterm labor (labor before the 37th week of pregnancy).
Other signs to contact your health care provide:
You don't have to have a birth plan. But having one is a great idea! A birth plan is a set of instructions you make about your baby's birth. It tells your provider how you feel about things like who you want with you during labor, what you want to do during labor, if you want drugs to help with labor pain, and if there are special religious or cultural practices you want to have happen once your baby is born. Fill out a birth plan with your partner. Then share it with your provider and with the nurses at the hospital or birthing center where you plan to have your baby. Share it with your family and other support people, too. It's best for everyone to know ahead of time how you want labor and birth to be.
You may feel Braxton-Hicks contractions starting early in your third trimester. They're usually painless but can be uncomfortable. They are different from true labor contractions. Braxton-Hicks don't come in a regular pattern, and they don't get closer over time. They may stop when you walk, change positions or rest. They may happen more often in the evening, especially if you're dehydrated. They may be weak and stay that way, or there may be a few strong ones followed by weak ones. You usually feel them in the lower abdomen and groin. True labor contractions come in regular intervals, get closer together and steadily stronger, and last 30 to 90 seconds. They don't go away, no matter what you do. The pain usually starts in the back and wraps around to the front. If you're having any kind of contractions and think you might be in labor, call your provider.