<unk>  is a bluish discoloration of the cervix, vagina and vulva caused by venous congestion. It can be observed as early as  6-8 weeks after conception, and is often used as an early<unk>  of pregnancy.
These color changes were discovered in approximately 1836 by French doctor Etienne Joseph Jacquemin (1796-1872).
Chadwick's sign
Adson's sign
Rigler's sign
Cullen's sign
Goodell's sign
Pemberton's sign
Hegar's sign
Rovsing's sign