Pain that keeps coming and going every 30 to 60 minutes this late in pregnancy, even with a closed cervix two days ago, needs a fresh check rather than waiting out the course of medicine. Continuing or stopping it isn't a decision to make without your doctor reviewing you first.
Next Steps
Please go back to your obstetrician today, since the pain hasn't settled despite two days of treatment. She'll check whether your cervix has changed and whether this is early labor starting.
Health Tips
Go to the hospital right away if the pain becomes very frequent or severe, or if you notice bleeding, fluid leaking, or reduced baby movements.