I have been having heart palpitations, lately i feel nauseous and feel pain or cramp at my upper abdomen, unsure if its just normal gastric or signs of heart disease. i do feel a bit of uncomfort at the chest mainly middle and right side, but mild.

Time to see a doctor: A young adult woman who feels palpitations should be checked by her primary care doctor (Family Medicine or Internal Medicine, not Ob-Gyn) to make sure her body is ok from a general check-up point of view, and to listen to her heart. It could be a thyroid hormone problem, or could be that her heart is beating irregularly for another reason, etc... Additionally, a cardiologist can also evaluate.