Taken from WebMD:
"Within the first 2-4 weeks after fertilization, HCG usually doubles every 48-72 hours. That usually corresponds to HCG levels below 1200 IU. From 1200-6000, the HCG usually takes 72-96 hours to double. Above 6000 IU, the hCG often takes over four days to double."
And as the pregnancy progresses through the first trimester, those numbers are going to slow quite a bit. They will then plateau and begin dropping. This is normal. I've talked to women with numbers around 30,000 to 40,000 and their doctors are worrying them because the levels are not going up. They've been fine. In fact, according to Healthline, these are normal levels for women:
and according the American Pregnancy Association:
- Six weeks LMP: 1,080 to 56,500 mIU /ml
- Seven to eight weeks LMP: 7,650 to 229,000 mIU /ml
- 9 to 12 weeks LMP: 25,700 to 288,000 mIU /ml
"The level will reach its peak in the first 8 – 11 weeks of pregnancy and then will decline and level off for the remainder of the pregnancy."
Really, hCG levels are useful in determining that you do not have ectopic pregnancy. After they find the gestational sac, most doctors will stop taking hCG levels because your numbers can rise and be normal. They can plateau and be normal. They can drop and be normal.