I have had this the last week or so I asked my widwife today she said to keep an eye on it and if I feel heart quickening go to the hospital straight away
Try drinking a Cold can of sprite
Its a possibility it maybe gas trapped which can be really painful. I have had it my entire pregnancy and the only thing that help was either a ginger ale or some tea.
Could be serious! I'd get it checked out... It could be just heartburn, but it could also be gallbladder or heart! I would definitely call your doctor