Hi,
Some of the side effects of the birth control pills - Gildess include breast tenderness, water retention which may have led to increase in breast size. All the effects of the drugs are reversible after discontinuation of the drug. However you can also think of changing over to some other pill. Consult your Doctor. Hope this helps.
The answer is based on information provided. Exact advice is not possible without a proper examination and investigations. You are requested to consult your Doctor. Take care and keep us posted.