Cramps are a warning. The feeling of cramping may signal uterine contractions, uterine infection, bladder infection or other problems. Many can be treated, but it is essential that a pregnant woman with cramping contact an OB provider. In most cases she will be asked to go to labor & delivery for evaluation and monitoring for labor. No one should try to "manage" uterine cramping alone. That would be too risky for baby!
Warm compresses. Everyone cramps off and on in pregnancy and tends to get low back pain from the change in posture and weight distribution. Tylenol (acetaminophen) and warm compresses help, as well as pre-natal yoga or pilates. Eating small, healthy meals frequently will help if the cramps are intestinal in origin.