Stomach movement and an unusual feeling could possibly point to irritable bowel syndrome or if it is a one-off thing it could be something like food poisoning. If it is a case of the latter, it should subside within a few days. However, if this movement continues, it is always best to visit a GP; it is likely they would test for irritable bowel syndrome among other possible causes.
The second thing is to take a pregnancy test; even though you may not have missed a period it is still possible to be pregnant. Some people have light periods throughout pregnancy and, although this is rare, a missed period should not be the only sign to take seriously. In addition to the movement which is being experienced; are there any other symptoms which may suggest pregnancy? For example; changes is weight, tender breasts, changes in appetite, metallic taste in the mouth, extreme tiredness or achy joints. Take a pregnancy test to just make sure that pregnancy isn't the cause and if any of these other symptoms are present visit a GP and ask them to do a test. Most pregnancy tests rely on HCG levels in the body (this is the pregnancy hormone) and if for some reason HCG levels are low; a pregnancy test can still come up as positive.
All in all I would advise a visit to the GP as this is the best and quickest way to put your mind at rest. They will test for anything with the given symptoms and will be able to treat whatever the problem is.
The second thing is to take a pregnancy test; even though you may not have missed a period it is still possible to be pregnant. Some people have light periods throughout pregnancy and, although this is rare, a missed period should not be the only sign to take seriously. In addition to the movement which is being experienced; are there any other symptoms which may suggest pregnancy? For example; changes is weight, tender breasts, changes in appetite, metallic taste in the mouth, extreme tiredness or achy joints. Take a pregnancy test to just make sure that pregnancy isn't the cause and if any of these other symptoms are present visit a GP and ask them to do a test. Most pregnancy tests rely on HCG levels in the body (this is the pregnancy hormone) and if for some reason HCG levels are low; a pregnancy test can still come up as positive.
All in all I would advise a visit to the GP as this is the best and quickest way to put your mind at rest. They will test for anything with the given symptoms and will be able to treat whatever the problem is.