What is the term for bluish discoloration of the vagina and cervix observed during pregnancy?

The term for the bluish discoloration of the vagina and cervix observed during pregnancy is Chadwick sign. This sign is a physiological change that occurs due to increased blood flow and vascularization in the pelvic region, which is induced by the hormonal changes that accompany early pregnancy. The bluish tint is typically visible around the sixth week of gestation and can be an important clinical indicator of pregnancy during a physical examination.

In contrast, the other signs mentioned refer to different aspects of pregnancy evaluation. Hegar sign pertains to the softening of the lower uterine segment, Goodell sign indicates the softening of the cervix, and McDonald's sign refers to the ease of flexing the uterine corpus against the cervix. While all these signs are relevant in the context of pregnancy, Chadwick sign is specifically associated with the distinctive bluish discoloration observed.