Here is a litle bit on preterm labor if you are concerned. Find out of she has any other symptoms and get her to her doctors if she doesn't feel right. Good luck
Symptoms can include, but are not limited to:
Pressure in the pelvis or vagina, or a sense that the baby has "dropped" prior to 36 weeks.
Tightenings or contractions that seem to occur at more or less regular intervals (more than four to five per hour).
Pain that comes and goes, whether it occurs in the lower abdomen or in the back.
Any fluid loss or spotting.
It is important to keep well-hydrated to both prevent uterine irritability and to prevent urinary tract infections that can lead to preterm labor. When my clients feel that things are "not quite right," I have them come in so that they can be checked. Diagnosed early, premature labor can be stopped and the pregnancy can be carried to term.