HCG levels are detectable at low levels as early as 7-9 days after ovulation. During the first 3-4 weeks after fertilization the HCG level doubles every two days. By the fist missed period the level will be 50-250 mIU/ml. HCG will peak at approx. 60-70 days after fertilization at 80,000-150,000 mIU/ml, then gradually decrease during the remainder of the pregnancy.
i found this on net hope this helps
I am 7 an a half week prego, i think. i took 4 home preg. test and they said positive, i went to docs and their test said neg. I then got my blood work taken and it says my Hcg levels are at 13%...no one can give me an answer---am i prego?