In a healthy pregnancy your HCG levels should double every 48 hours. But when the pregnancy is not progressing the way it should as in the case of chromosomal abnormality your HCG may rise at slower rates or rise at first and then start to decline.
Definition of moot. 1 : a deliberative assembly primarily for the administration of justice; especially : one held by the freemen of an Anglo-Saxon community.
A moot point is similar to receiving negative points. While one person may score several points in a game of hockey, another opponent can score several moot points because he screwed up or just plain sucks.