39 weeks pregnant stomach rock hard with no pain it's hard constantly not sure what that means?

Over due: You are close to being overdue. Do you feel your baby moving? After 41 weeks there is increased risk to your baby due to the placenta becoming less efficient. You should see your doctor immediately for an ultrasound and evaluation. You could have increased amniotic fluid or other problems. He may want to induce labor or do a C section.