you will probably need an ultrasound or MRI is see if the cyst has changed.
Get another doctor - if you ahve a cyst that big on your ovary, in pain, and he gave you birth control for that there is something wrong. If you have pressure on your bladder too - there is something going on. GET ANOTHER DOCTOR - get a pelvic abdominal sonogram or cat scan and
get a CA125 blood test to check for ovarian cancer. Get a copy of your reportso from these tests. Go to your primary or even an internist for help but definitely get another opinion.