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.
Stomach bloating is caused by gas that gets trapped in the intestines and colon. It is normal for the digestive tract to produce gas. Everyone gets gas that gets processed through the mouth and rectum. That gas is produced in the body either by ingesting it when we eat or by being formed during digestion.