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Right lower quadrant abdominal pain
may be related to appendix, lymph node, urinary stone
and if you are female ovarian condition too. Most of these causes can be ruled out by an ultrasonography
I see you've already got an ultrasound
scan along with blood and urine test done. If the test is normal, then it is less likely that you suffer from the aforementioned ailments. If the symptoms persist, you may get a computed tomography
(Plain and contrast) scan done to confirm ultrasound findings.
If all the above test comes normal, then perhaps the pain is a non specific muscular ache.
Hope this answers your query.