Welcome to healthcare Magic!
The episodic pain abdomen in right lower abdomen can be due to infection, gaseous distention, diverticulitis
, or severe acid peptic disorder. The birth control pill usually does not cause such symptoms.
you have already ruled out.
Getting a physician opinion after a physical examination would be helpful and an ultrasound
abdomen and a complete blood counts would be helpful.
I hope the advise would be informative and useful for you.