Thanks for your query.
Femilon is a hormonal oral contraceptive
It is a combination of desogestrel and ethinylestradiol
Like all hormonal pills even this has few side effects like:-
-Nausea, dizziness,vomiting, bloating, stomach cramps;
-Increased hair growth, loss of scalp hair;
-Increased vaginal itching
-Changes in your menstrual periods, decreased sex drive.
These side effects are reversible and go away once you stop the pills so no reason to get worried.