Normally in new couple it's common having pain, but if it persists, it's called dyspareunia &It needs medicinal management. The cause may vary from muscle stiffness, spasms to pain sensitivity & Withdrawal. One needs to understand the unique cause in your case through case taking. Medication depends upon the cause. Sexual counseling to both partners will also help to overcome pain conditioning.
Next Steps
consultation needed.
Health Tips
foreplay will help to lubricate the part & Ease insertion.