Thanks for the query.
Usually oral contraceptive pills
will suppress the internal hormones and maintain in low levels.
So ovulation do not occur usually. But rarely it can occur.
Sometimes adhesions due to previous rupture or pelvic inflammatory disease
can also cause these symptoms.
So after undergoing ultrasound
the possible cause for your pain can be identified and treatment can be taken accordingly.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429