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Contractions During Pregnancy: What to Expect - Topic Overview

Regular contractions may mean that your uterine muscle is tightening (Braxton Hicks contractions) or that you are in labor. It may be hard to tell the difference between Braxton Hicks contractions and true labor. If there is any doubt, call your doctor.

Braxton Hicks contractions

During the second and third trimesters of pregnancy, you may have episodes when your belly tightens and becomes firm to the touch, then relaxes. These are episodes of tightening (contraction) of the uterine muscles called Braxton Hicks contractions. These normal contractions may be mild, or they may be strong enough to make you stop what you are doing.

Braxton Hicks contractions can begin as early as the 20th week of pregnancy, but most often they start between the 28th and 30th week.

Braxton Hicks contractions can occur often during the 9th month, such as every 10 to 20 minutes.

Braxton Hicks contractions:

  • Usually go away during exercise or activity. True labor pains continue or increase with activity.
  • Are felt more during rest.

Preterm labor

The length of a normal pregnancy is 37 to 42 weeks, measured from the date of the woman's last menstrual period. Preterm labor occurs before the 37th week of pregnancy. Before 20 weeks, preterm labor that leads to delivery is a miscarriage (spontaneous abortion).

Preterm labor is diagnosed in a woman who is 20 to 37 weeks pregnant and has regular uterine contractions. This means 4 or more in 20 minutes, or about 8 or more in 1 hour.

Call your doctor if you have had regular contractions for an hour, even after you have had a glass of water and are resting.

Early labor

Early labor is often the longest part of the birthing process, sometimes lasting 2 to 3 days. Uterine contractions:

  • Are mild to moderate and last about 30 to 45 seconds. You can keep talking during these contractions.
  • May be irregular, about 5 to 20 minutes apart, and may even stop for a while.

In early labor, the cervix opens (dilates) to about 3 cm (1.2 in.).

First-time mothers may have many hours of early labor without the cervix dilating. You may go to the hospital and be sent home again until you begin active labor or your water breaks (rupture of the membranes).

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