And there is no sure way to know this without having a vaginal exam done. Such exams should be limited as they have the potential themselves to cause the uterus to contract even more. Other signs of preterm labor include different or increased vaginal discharge or any bleeding which happens when the cervix dilates. Also, low pelvic pain and rectal pressure can be a sign that the baby is descending in the pelvis and eager to be born. The reasons for preterm labor are varied and not much conclusive research has been done.
Some medical conditions can cause it as can some anatomical abnormalities.
These should be discussed with your doctor early in labor if anything is known about them. If preterm labor does become an issue, bedrest and medications are usually the solution to keep your baby gestating as long as possible. Though neither of these options are very appealing they are a way to save your baby. So watch and listen to your body and talk with your health care provider about any concerns you have. Watching for signs of preterm labor is the best way to deliver a full-term healthy baby.