Some pain is expected after a hip replacement, especially after exercises. It does not mean the new joint is being damaged - gentle, regular movement is what helps it settle.
Take the pain relief your surgical team prescribed, the way they prescribed it. Many people find exercises easier a little while after their pain medication.
In your daily exercises, always report your pain honestly. The program adapts to what you report - there is no reward for pushing through severe pain.
Stop and contact your clinician if the pain becomes very severe, arrives suddenly without a reason, or feels different from your usual post-operative soreness.