According to the symptoms you gave(abdominal pain, sulphur like smelling gasses, seventh week pregnancy), you might be experiencing irritable bowel syndrome or a change in the symptoms of irritable bowel syndrome if one previously existed.
Many pregnant women experience changes in the symptoms related to their irritable bowel syndrome. The hormonal changes affect the symptoms. It is easily seen even in non-pregnant women, who report changes in the symptoms around their menstrual period. The changes might be different in different women, in the same woman in a different pregnancy, and even in the same woman during the same pregnancy. Women usually experiencing diarrhea might experience constipation, abdominal bloating, and excessive quantity of gasses. In others the opposite might be present.
As you can see, there is diversity in the way a woman reacts with irritable bowel syndrome during pregnancy. Even among the doctors there is no consensus about how the symptoms would change during pregnancy.
You might want to visit your family doctor for a physical examination and laboratory tests to rule out other more serious conditions. If necessary, he might refer you to a specialist for the gastrointestinal tract. Please be advised to remember to ask if all the medications that might be recommended for treatment of irritable bowel syndrome are allowed to be taken in pregnancy.
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