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Throughout pregnancy, the layers of your uterus will tighten irregularly which are usually not painful, these are known as Braxton-Hicks contractions and are usually irregular and do not open the cervix. If these contractions become regular or more frequent (one every 10-12 minutes for at least an hour) they may be premature labor contractions which can cause the cervix to open. It is important to contact your health care provider immediately.
One of the first things that your practitioner will tell you to do if you are having contractions is staying very well hydrated. We definitely see the preterm labor rates go up in the summer months.
In some cases the cervix dilates prematurely without pain or perceived contractions, so that the mother may not have warning signs until very late in the birthing process.