Menstruation quantity is little blackening is pregnant

If a woman's menstruation arrives at a normal time, showing a small amount and dark color, pregnancy can be ruled out, if the menstrual period shows a significant delay after bleeding and dark color, there is a possibility of threatened abortion after pregnancy. Because women's menstruation and pregnancy are mutually exclusive, if normal menstruation, indicating that there is no pregnancy, if normal pregnancy is not due to menstruation, in women after pregnancy if because of the impact of the external environment, or their own low progesterone caused by threatened abortion, may cause vaginal bleeding.