hello i have noted your problems and queries..
Reason for your stabbing pain
in that area may vary from simple muscoloskeletal pain due to excessive strain during exercise and stretching to right ovarian pain
Its unlikey to be appendicitis
where you ll have sever vomiting with or with out fever along with intaractable pain abdomen radiating to umbilicus..
its also unlikey to be rupture in view of your medication history due to RA cause it will cause sever intractable pain
abdomen with vomiting which is not the case in you..
how ever i would suggest you to conslult a physician get your self examined to confirm its just a musculoskeletal pain
try some analgesic gel like volini gel local application at pain site twice daily...
wish you speedy recovery