It is very common to see a 6-cell embryo because all of the cells don't divide at the same time. So it doesn't exactly follow the 1-2-4-8 cell pattern. Nothing to worry about.
The term is "compacting", not compounding. It means that the cells of the developing embryo have begun to adhere closely to each other. This usually occurs at around the 8-cell stage of development, but can happen earlier or later. In any case, compaction is a necessary prerequisite for blastocyst development which is, in turn, necessary for attachment and implantation.
Glad to hear about the positive hCG. Cautious optimism is in order.
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