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vagary - an unexpected and inexplicable change in something (in a situation or a person's behavior, etc.); the vagaries of the weather; his wealth fluctuates with the vagaries of the stock market; he has dealt with human vagaries for many years.
Goodell's Sign is a softening of the cervix and vagina - an indication of pregnancy. Hegar's sign is a softening at the cervix (lower end) and the fundus (top of) the uterus - an indication of pregnancy. While similar conditions may have alternative causes - Braxton Hick's, Chadwick's, Goodell's and Hegar's are all found in pregnancy.