Blood in the first month of pregnancy is caused by a small amount of bleeding from the endometrium. 6-7 days after intercourse fertilized egg formation, early blastocyst began to move to the uterine cavity bed development, later slowly implanted in the endometrium to form a gestational sac, this time is about 1 month of pregnancy, blastocyst constantly buried to the endometrium so that the endometrium metamorphosis, direct contact with the endometrium will cause a small amount of bleeding, so there will be blood discharge or a small amount of brown discharge, this is a normal phenomenon without special treatment. It is normal to keep the pubic area hygienic and clean, avoid tension, take more rest, avoid strenuous exercise, avoid going out too much, keep a good mood and ensure quiet rest is very beneficial to keep the fetus. A small amount of blood in early pregnancy does not affect the normal development of the gestational sac. After pregnancy, you should go to the hospital regularly to check the development of the gestational sac and determine whether the baby is developing normally to exclude ectopic pregnancy and fetal abortion.