After i finished chemo treatment 2 years ago for breast cancer, i had port removed. for the past week, i have been feeling pain where it was removed?

Scar tissue forms: I doubt that it is anything to worry about. After surgery, there is scar formation which can sometimes become sensitive and cause discomfort. It twill likely go away on its own. You could take Tylenol if the pain is more than mild. Try to feel for any knot under the scar. If there is anything that rolls/feels like a lump, then you need to consult your surgeon or the oncologist for examination.