Hi, Femiplan contains both estrogen and progesterone that is used to prevent unwanted pregnancies from unprotected sexual intercourses. Combined oral contraceptive pill may cause weight gain in women. Their abdomen may become bigger than before due to deposition of excess fat in the abdominal are after starting the combined oral contraceptive pills. Side effects of Femiplan are nausea, vomiting, diarrhea or constipation, indigestion, stomach pain, bloating, weakness, tiredness, fatigue, changes in appetite, acnes, facial hair growth, irregular uterine bleeding, spotting or breakthrough bleeding between periods, breast tenderness and enlargement, changes in sleep pattern, mood swings, depression, dry mouth, vaginal dryness, easily bruising or bleeding, increased thirst, anxiety, nervousness, changes in sexual drive, vaginal discharge, vaginal bleeding, allergic reactions etc. If these side effects persist for long or bother you, then you should inform your doctor first for medical help. Take care. hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician