You mean your HCG numbers. That's human chorionic growth hormone, and it's a blood test; some people call it a beta. It's a reading that corresponds to how fast your embryo is growing and the state of the pregnancy. The number should statistically double at a regular rate, but some people do have a slower rate that will increase later. If the number is greater than 5, it means you're pregnant. There are guidelines for what it should be by week, but so far your doctor is telling you that so long as you're above 2000 for week 5, everything is okay. At your point somebody else could have a lot higher number, maybe 4 or 5 times higher. A falling number indicates a pregnancy that is going to be lost. So long as yours is still climbing, that's good. Nine weeks is when they have an ultrasound to check for a "good" pregnancy. There is absolutely nothing that can be done between now and then, so the best thing to do is just try to relax and not think about the numbers. Nobody has any control over it.
If you had had progesterone measured, it only needs to be above about 12 for the pregnancy to continue. That number rises a lot more slowly.
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