Chadwick's sign
Chadwick sign is a medical clinical sign characterised by the bluish-violet discolouration of the mucous membranes of the vulva, vagina (particularly on the anterior vaginal wall), and the cervix, resulting from venous congestion due to increased blood flow as part of the maternal physiological changes in pregnancy. This clinical sign can be observed during a patient's examination as early as 8 to 12 weeks' gestation, serving as an early sign of pregnancy, but it is rarely seen before 7 weeks' gestation.