Getting pregnant 20 days after having a chest X-ray usually has no effect. Fertile women who have intercourse during ovulation will most often complete fertilization within 24 hours of ovulation, and pregnancy can be confirmed by a blood pregnancy test about 10 days after intercourse. Chest X-ray examination is an X-ray examination, although it is a kind of ionizing radiation, but when pregnancy is found 20 days after the examination, it usually has no effect on pregnancy because of the small radiation dose and long interval. In early pregnancy, ultrasound is performed at about 6 weeks after menopause to confirm a normal intrauterine pregnancy and also to find out how the embryo is developing. When the embryo is well developed, the pregnancy can continue, and the doctor’s instructions should be followed to carry out NT (fetal nuchal translucency) measurement, Down’s syndrome screening or non-invasive prenatal testing technology, fetal structural anomalies screening and other related screening tests on time.