If you are just pregnant and have been bleeding from the bottom, consider biochemical pregnancy, preeclampsia, ectopic pregnancy and so on. 1. Biochemical pregnancy: Biochemical pregnancy is the combination of sperm and egg to form a fertilized egg, but miscarriage occurs without implantation. After the formation of the fertilized egg, human chorionic gonadotropin can be detected in the serum, which is judged to be pregnancy, and after the miscarriage, there will be vaginal bleeding. 2. Pre-eclampsia: If the fetus has chromosomal problems after pregnancy, or the mother has some diseases, the fetus can not develop normally, there will be pre-eclampsia, mainly manifested as vaginal bleeding and abdominal pain. 3. Ectopic pregnancy: Ectopic pregnancy refers to the formation of sperm and egg fertilized egg after not in the uterine cavity, but in other parts of the bed, the more common is the fallopian tube area, due to the fallopian tube is relatively small, the gradual growth of the fertilized egg will lead to the fallopian tube rupture, intra-abdominal hemorrhage, the endometrium will be stripped of the occurrence of vaginal bleeding. If you have just gotten pregnant and keep bleeding down there, consider it abnormal, and you should go to the hospital in time.