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Here's the 411 on HCG levels. 1. The blood test results give your the exact HCG levels, so ask you doctor for the blood test levels if you want those results. 2. HCG levels double every 3 days, so by 2 weeks in they have gone from 10 (day 1) to 20 (day 4), 40 (day 7), 80 (day 10), 160 (day 13), 320 (day 16), 640 (day 19) etc. It peaks and then begins to drop off around 12 weeks, when the placenta is then able to produce the enough hormones on its own to maintain the pregnancy. If the HCG is not doubling like this, it can be a sign of ectopic or that you eon't be able to maintain the pregnancy. That being said, many pregnancies keep going with low levels, so don't give up.

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