Post delivery pelvic pain

I’ve delivered my child via natural birth with 2nd degree tear. I’m now 16 days postpartum. The stitches are not hurting anymore but my front pelvic area hurts/feel heavy whenever I sit up from a lying position or standing up from a sitting position. Anyone has encountered similar situation? I’ve done my 1st review with my gynae last week and he said the wound was healing well with no swelling or infection.