Nucleic acid test for pregnant women has no effect on the fetus. Nucleic acid test is usually done by swabbing the mucous membrane of the nasal cavity or pharynx of the test subject through a nasal swab or a pharyngeal swab, and then searching for viral DNA through certain detection means, so as to determine whether the test subject has a viral infection or not. This method of testing is usually less damaging to the body, and generally does not cause harm to the pregnant woman, nor does it adversely affect the fetus. Since the test will stimulate the nasal or pharyngeal tissues of pregnant women, it may cause them to sneeze, cough, nausea and other physiological reflexes, so do not eat too much before the test to avoid vomiting. During the test, you should actively cooperate with the staff and relax to reduce the discomfort.