I have upper right quadrant pain only when i bend over since 3 days, what could that be?

Try to recall if you had done anything 1-2 days before the pain occurred which can affect the abdominal muscles (strain). Right upper quadrant is the location of the liver and biliary tract but body movement less likely precipitates the pain from this organ. You can do a therapeutic diagnosis by taking Ibuprofen OTC 200 mg x 3. If pain subsides significantly, muscle strain is likely the culprit.

Could be pulled muscle in belly wall or gas in gut. Your body is talking to you. Listen and take good notes any you an your Drs can figure it out.