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 debatable question, an issue open to argument; also, an irrelevant question, a matter of no importance. For example, Whether Shakespeare actually wrote the poem remains a moot point among critics, or It's a moot point whether the chicken or the egg came first. This term originated in British law where it described a point for discussion in a moot, or assembly, of law students.