Femilon is the brand name of an oral contraceptive pill. It contains two hormones: desogestrel and ethinylestradiol. Some of its side effects are: intermenstrual bleeding, post-medication amenorrhoea, changes in cervical secretions, increase in the size of fibroids, aggravation of endometriosis and certain vaginal infections (e.g. candidiasis). I suggest you consult a good gynaecologist to exclude the possibility of any disorder, whether or not related to the use of Femilon.