hi, most probably it is ITB Pull. it will take few weeks to heal by itself. Not a issue of concern if the pain is reducing day by day, and no signs of swelling near groin area or irritation during urination.
avoid squatting as it will again stretch the ligament to its full length.
you should certainly go for lower abdominal / thigh ultrasound only if prescribed by the physician if the PAIN IS NOT REDUCING AT ALL, INCREASING WITH TIME, SOME IRRITATION IS PRESENT WHILE PASSING THE URINE.
Next Steps
you can apply icepack/coldpack at groin/ thigh region for 2-3 minutes and take a break for same duration and reapply.
Health Tips
Avoid squatting, Avoid running/walking with a long stride, and also avoid cross legged sitting. STAY HEALTHY