Redness just after pregnancy is detected may be a normal phenomenon, such as bleeding at bedtime, but it may also be caused by certain pathological factors, such as biochemical pregnancy, embryonic arrest or ectopic pregnancy. Common causes I. Physiological factors: Because of the rupture of a small number of blood vessels in the endometrium caused by the fertilized egg, a small amount of bleeding may occur, which is reflected as redness, the amount of bleeding is very small and usually stops after 3-5 days, no special treatment is needed. Pathological factors: 1. Abnormal pregnancy: abnormal pregnancy conditions such as pre-eclampsia, biochemical pregnancy, embryonic arrest and ectopic pregnancy may result in vaginal bleeding. If the HCG doubles within 48 hours and a gestational sac is found, the pregnancy is basically normal and may be due to a preterm miscarriage, which should be treated with birth control medication. If the HCG in the blood is not doubling well or is decreasing, it is possible that the pregnancy is biochemical or the embryo has stopped developing and should be terminated and checked for intrauterine residues. If a mass or abdominal pain can be seen outside the uterine cavity, it may be ectopic pregnancy, which can be treated conservatively or surgically. 2. Gynecological diseases: some pregnant women have cervical lesions, cervical inflammation, polyps and other abnormalities, which need to be examined for the cervix and can be treated with targeted medication in general, and if surgery is needed, it can be done after delivery. Precautions The early stage of pregnancy is a critical period for the differentiation and development of the embryo, which is especially susceptible to external factors. It is recommended that pregnant women should maintain a good mood, take timely supplements of folic acid and other nutrients, get enough sleep every day, and avoid sexual intercourse as much as possible.