Which sign indicates a bluish tint of the vagina during pregnancy?

Chadwick's sign is a significant indicator during pregnancy, referred to as the bluish discoloration of the vagina and cervix. This sign occurs as a result of increased blood flow and vascularization in the pelvic region due to hormonal changes, particularly the rise in estrogen levels. The bluish tint develops as early as six to eight weeks of pregnancy and is often used as a clinical indicator for early pregnancy when assessing a patient.

In contrast, Hegar's sign indicates softening of the lower uterine segment, Goodell's sign refers to the softening of the cervix, and Montgomery tubercles are sebaceous glands that become more prominent during pregnancy. These signs and changes also have their relevance but do not specifically indicate the bluish tint of the vagina. Thus, the distinct coloration observed as Chadwick's sign is a specific manifestation of increased vascularity associated with the early stages of pregnancy.