You will find a list of the side effects of Ovcon 35 at
http://www.drugs.com/PDR/Ovcon_35_Tablets.html
see SIDE EFFECTS OF ORAL CONTRACEPTIVES
2. Gastrointestinal effects
The most frequent, unpleasant side effects are nausea and vomiting, stomach cramps, bloating, and a change in appetite.
If these symptoms persist, talk to your doctor.