Early pregnancy tests work by binding the hCG hormone, from either blood or urine, to an antibody and an indicator. The antibody will only bind to hCG; other hormones will not give a positive test result. The usual indicator is a pigment molecule, present in a line across a home pregnancy urine test.
Gas and bloating is a sign that food is not being digested correctly by the body. An inadequate intake of water will cause excessive stomach bloating. Water benefits the body by aiding with digestion because it supports a majority of the body's daily functions.
An uncomfortable bubble in your belly could be gas trapped from eating too much in one sitting. Overeating is one of the most common causes of bloating. Research published in the International Journal of Obesity found that if you're binge eating, you're even more likely to encounter gassiness.