Women who have had a c14 breath test should wait a minimum of three months before becoming pregnant. The H. pylori breath test can detect H. pylori in the stomach, but c14 is contaminating to the body and the environment. Children and pregnant women generally cannot be examined by this method, and the isotope in the body cannot be cleared immediately after the H. pylori breath test for normal women, so it is best to wait three months before getting pregnant to prevent miscarriage, premature birth, and developmental malformations of the fetus. In addition to the c14 breath test after three months to get pregnant, other things such as ct, harmful radiation, toxic substances, certain prohibited drugs, it is also best to avoid exposure during pregnancy preparation.