Hi welcome to Health care magic forum. Pain in the right side of abdomen could of many reasons as if in the upper abdomen of gastric or hepatic origin, if in the middle and radiating to the lower abdomen it may be of renal origin so could be renal stone or urinary tract infection
, if only in the lower abdomen may be appendicitis
, T.B.intestine, or in the lower abdomen and coming upto the middle means cystitis
So i advise you to consult a surgeon for diagnosis and treatment. as already 3 days passed it is not appendicitis. More chances ore for u.t.i. only. you may need to have C.T.scan besides other routine tests for confermation.
Don't worry you will be fine with medicines only, no surgery is required , and thanks for calling.