A negative result can mean that you are not pregnant, you took the test too early, or you took the test wrong. Pregnancy tests vary in their sensitivity (how soon they can detect the hormone hCG), and you may not have given your body enough time to produce enough hCG hormones that will show up on the test. Also, if you let a test sit for too long (after the instructions on the box tell you), the test is invalid.
1 Certain types of food are known to cause flatulence and bloating. 2  Foods that are high in carbohydrates and starch such as beans, cabbage, broccoli, white bread and refined flour can result in an excess of gas trapped in the digestive system.3  Many of these foods can cause exceptionally foul smelling gas as well. Many of these foods can cause exceptionally foul smelling gas as well. 2  Foods such as red meats (especially ground beef) and fatty foods release gases such as hydrogen, methane and carbon dioxide during the digestion process.
Flatulence usually only has a bad smell if it contains gases that smell, such as sulphur. However, it's important to remember it's normal for the gas you pass to sometimes smell a bit. Excessive flatulence can be caused by swallowing more air than usual or eating food that's difficult to digest.latulence usually only has a bad smell if it contains gases that smell, such as sulphur. However, it's important to remember it's normal for the gas you pass to sometimes smell a bit. Excessive flatulence can be caused by swallowing more air than usual or eating food that's difficult to digest.