Let me catagorically tell you that "Focal nodular hyperplasias" of the liver have no tendency to rupture or turn malignant and they are not related to oral contraceptives.
Resection of this tumour is often advised because it is difficult to distinguish from hepatic adenoma.
Hepatic adenomas on the other hand are related to oral contraceptives and have a tendency to rupture especially during pregnancy.
As you have been rightly advised by Theresa Jones RN already, you must consult your gastroenterologist and decide on the future management strategy.
MB BS, MS, FRCS(Edinburgh)