I cannot advise you. However, the larger a cyst gets, the greater the risk for ovarian torsion which can choke off blood supply to the ovary causing it to die. Since our ovaries are vital our WHOLE LIVES (not just for having babies), it is also important to remove just the cyst (provided it is benign / non-cancerous) and leave as much ovarian tissue as possible (for both fertility and endocrine reasons). This may or may not be harder to do the larger a cyst gets. Cysts can encapsulate the ovary since the ovary is only about the size of an almond so removing a cyst is more like shelling out a pearl (the ovary) from an oyster (the cyst). This site may be helpful to you - http://ovaryresearch.com/ovarian_cysts.htm.
Is your doctor planning to do a cystectomy (cyst removal) so you will still have your ovary or at least most of it? Some surgeons don't have good cystectomy skills so you will want to be sure you have one who does.