Having intercourse last month and getting pregnant the next month is usually a case of mistaking vaginal bleeding for menstruation and not detecting pregnancy early. Vaginal bleeding after pregnancy may be normal bleeding from the fertilized egg’s implantation, or it may occur in the case of pre-eclampsia, ectopic pregnancy or in combination with certain diseases, which need to be identified and treated promptly. Common causes and treatment 1. bleeding from fertilization: bleeding from fertilized egg can occur around 6 days after fertilization and last for about 2 days, the discharge is red or light red, usually no treatment is needed; 2. pre-eclampsia abortion: the patient does not know she is pregnant yet, a small amount of bleeding can be mistaken for menstruation, the patient can have abdominal pain, stomach drop and other symptoms, need to do fetal preservation treatment, oral dydrogesterone, etc. It is recommended that when abortion is unavoidable 3. Ectopic pregnancy: the fertilized egg is implanted outside the uterine cavity, such as the fallopian tube, and vaginal bleeding can occur in the early menopause, with irregular bleeding time, small amount, dripping, short duration, etc. It can be accompanied by abdominal pain on one side, which can be diagnosed under vaginal ultrasound. Irregular vaginal bleeding, if the patient does not know she is pregnant will think it is menstruation, the symptoms can be observed in mild cases, in serious cases, such as large menstrual flow triggering anemia, myoma enlargement with compression symptoms, laparoscopic removal of myoma. Pregnancy is a special physiological period for women, which requires attention in all aspects of diet and lifestyle to ensure the healthy growth of the pregnant woman and the fetus. First of all, it is necessary to have a balanced nutrition, with adequate protein, carbohydrates, moderate amount of fat, various vitamins, folic acid and minerals, paying special attention to calcium supplementation, and also iron supplementation to prevent anemia. The second is a healthy lifestyle, regular work and rest, proper exercise, and a happy mood. Finally, regular prenatal checkups should be conducted to detect abnormalities early to ensure the safety of the mother and fetus.