Hi!ovarian cysts at this young age are usually benign and resolve spontaneously.But we need to know certain specific ultrasound
characteristics of the cyst.The cyst you mentioned must have been a follicular or corpus luteal cyst
and hence you may have been given femilon. It is advisable to get a repeat pelvic scan done on the second or third day of your menstrual periods next cycle.As far as using femilon (or any other contraceptive
pill) is concerned,it depends on whether you are keen on conception immediately.If not trying for pregnancy
,continuing the pill is a good option as it has contraceptive and many non contraceptive health benefits.Fertility
comes back to normal within 2-4 months of stopping the pill.It should be started on the first day of the menstrual cycle(for contraceptive benefit) and taken for 21 days and restarted after 1 week gap.The side effects are generally well tolerated and you should consult your doctor to see if it suits you for long term use.