Red blood in early pregnancy may be caused by embryo implantation, preeclampsia, ectopic pregnancy and so on. 1. Embryo implantation: Embryo implantation may cause a small amount of vaginal bleeding, this situation is usually a small amount of bleeding, is not accompanied by abdominal pain and discomfort, lasts for 2 to 3 days, usually do not need to be treated, you can continue to observe, if the bleeding persists or the appearance of abdominal pain should be promptly seek medical attention. 2. Pre-eclampsia: Bleeding in early pregnancy accompanied by symptoms such as lumbago, abdominal pain and bloating suggests the occurrence of pre-eclampsia, which is mostly caused by the poor development of the embryo or the low level of progesterone in the pregnant woman’s body. At this time the bleeding is large, and it is necessary to go to the hospital as soon as possible to complete the relevant examinations, such as checking the progesterone and HCG (human chorionic gonadotropin) and uterine adnexal ultrasound, and so on. 3. Ectopic pregnancy: red blood in early pregnancy may also be the fertilized egg in the uterus outside the place to bed, will also lead to vaginal bleeding, may also lead to abdominal pain and discomfort. When the red blood in early pregnancy may also have other reasons, you should go to the hospital as soon as possible, under the guidance of the doctor to improve the relevant examination, identify the cause of the disease, symptomatic treatment.