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https://www.americanpregnancy.org/pregnancycomplications/earlyfetaldevelopment.htm
With both hCG levels and progesterone levels, it is not the single value that can predict a healthy pregnancy outcome. It is more important to evaluate two different values to see if the numbers are increasing. Levels of hCG should be increasing by at least 60 % every 2-3 days, but ideally doubling every 48-72 hours. Progesterone levels rise much differently than hCG levels, with an average of 1-3ng/ml every couple days until they reach their peak for that trimester. In situations when there is a concern of an ectopic pregnancy or miscarriage, hCG levels will often start out normal, but will not show a significant increase or will stop rising all together, and progesterone levels will be low from the beginning[/COLOR][/I]