Thank you for your query.
Pain and swelling on the right side and blood in urine following a car crash needs to be investigated thoroughly. In my opinion you should get an ultrasound
of the whole abdomen, in not already done, and get yourself reassessed for any injury
to your internal organs especially to the renal system.
I hope I have answered your query to your satisfaction.
Wishing you an early recovery.
Rajiv K Khandelwal