Ectopic pregnancy and menstrual bleeding can be identified by blood tests, color of bleeding and amount of bleeding. Ectopic pregnancy is also a pregnancy and the blood HCG (human chorionic gonadotropin) value in the body will be elevated. You can tell if you are pregnant by drawing blood and a urine pregnancy test will show a positive result. When menstrual blood comes, the HCG value does not rise and the urine pregnancy test is negative. A ruptured abdominal mass caused by ectopic pregnancy will have irregular bright red vaginal bleeding and tearing abdominal pain, with less bleeding than menstrual flow. Menstrual blood, on the other hand, is dark red bleeding that will be somewhat lighter and light red in color when it first comes, slowly deepening and eventually becoming lighter again and ending. The blood will not coagulate and usually lasts for 3 to 7 days is normal. In addition, vaginal bleeding after pregnancy should go to the hospital in time.