Pain below the right rib cage.

Occasionally... I feel a heavy pain just below my right rib. It's not a constant pain, but when it occurs, it lasts for a day or two, so I get worried. I had an upper abdominal ultrasound at Gut Hospital, and I was told there were no abnormalities. However, the person performing the ultrasound was a female technician, not a doctor, so I am a bit suspicious about whether the results were properly interpreted. I heard that the person doing the ultrasound needs to be skilled at reading the images.

I still feel pain sometimes, but they say there's nothing wrong, so there's nothing else I can do. Should I try going to another hospital?