Preterm labor is any labor that occurs from 20 weeks through 36 weeks of pregnancy. Here are the symptoms1:
It is normal for pregnant women to have some uterine contractions throughout the day. It is not normal to have frequent uterine contractions, such as six or more in one hour. Frequent uterine contractions, or tightenings, may cause the cervix to begin to open.
If a woman thinks that she might be having preterm labor, she should call her doctor or go to the hospital to be evaluated.
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