It’s right at the lowest side of normal. When my temp goes below 98, it usually means I am undermedicated for my hypothyroid condition. It doesn’t have to mean something is wrong, but it is an indicator that something might be. Do you have any other symptoms? Very tired dry skin and eyes? Brittle hair that is falling out? High blood pressure?
I don’t think it has anything to do with your tummy since it is a low temperature. Where exactly is the pain? If it is on your right side get to the ER. No matter what if it is very, sudden, pain you probably need to see a doctor.