If pregnancy is discovered after a chest X-ray, it may have certain adverse effects on the fetus. Pregnant women are advised to strengthen maternity checkups during pregnancy to detect fetal abnormalities early and take intervention measures as early as possible. X-rays from chest X-ray have a certain radiation effect. If exposed to radiation within 18 days of the formation of a fertilized egg, the fertilized egg may not be able to settle successfully resulting in miscarriage. If the fertilized egg is fully formed and has completed its implantation, radiation from X-rays at this time may cause fetal malformation, brain malformation, etc., and stop the development of the embryo causing miscarriage. If there is no effect on the fertilized egg, it usually does not lead to miscarriage or fetal malformation. Therefore, it is recommended to intensify pregnancy testing after pregnancy is detected by a chest X-ray and to pay attention to any abdominal pain or vaginal bleeding. If there is no preterm miscarriage, an ultrasound is recommended around 6-7 weeks of pregnancy to detect the fetal heartbeat, the size of the gestational sac and the yolk sac. As the fetus develops, NT test, Down’s syndrome screening and macroscopic screening are also needed. If necessary, non-invasive DNA test or amniocentesis can be done to further confirm the diagnosis and terminate the pregnancy if fetal abnormalities are found.