In many early pregnancies, the hCG level will double every 31 to 72 hours. As the pregnancy progresses, hCG levels rise and the doubling time increases.

许多的早孕，和HCG水平每31 - 72小时会翻倍，随着怀孕的进程，HCG水平的上升以及翻倍的时间也会增加。

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In many early pregnancies, the hCG level will double every 31 to 72 hours. As the pregnancy progresses, hCG levels rise and the doubling time increases.

许多的早孕，和HCG水平每31 - 72小时会翻倍，随着怀孕的进程，HCG水平的上升以及翻倍的时间也会增加。

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