What does chronic cramping during the 28th week of pregnancy mean?

Many possibilities: You should probably see your obstetrician. There is a very long list of possible causes for your discomfort. Your doctor will consider the normal physiologic/anatomic alterations associated with pregnancy, fetal well-being and gestational age, and causes of abdominal pain that may be more common due to the pregnant state or related to obstetrical complication.

Needs exam: Cramping and irregular contractions are common in the third trimester but before you assume it is normal you need to be seen by your doctor to assess your risk for preterm labor. The doctor may do a cervical exam, a sonographic cervical length and/or a vaginal test called a fetal fibronectin.