Im 31 weeks pregnant and have been getting serious pains that feels like menstruation pains and then also in between the pains i get cramps in my lower abdomen and sides. why am i experiencing this pain?

Call the Ob-Gyn Dr.: A 31-week pregnant woman with a tummy that gets cramps can call her Ob-Gyn doctor and go get examined at the doctor's office or at the hospital's labor and delivery ward. The doctor will be checking for preterm labor, which can lead to a preterm birth (and all the problems that come with premature babies). Preterm labor is serious, so it is important to be examined by an experienced physician.