Your ultrasound will give a much clearer picture of your pregnancy than the HCG levels alone, and the Clomid may well have influenced the levels of your test. I found a website with a very detailed explanation of what the HCG levels mean, and what the "norms" are for both single and multiple pregnancies. You can read some of the info below and more by clicking on the link to the site: http://www.advancedfertility.com/earlypre.htm

I would wait for the ultrasound before getting your hopes up (or worrying, whichever the case) about a multiple birth. Congratulations on your pregnancy. Please keep us posted!

"HCG levels in pregnancy

HCG, or human chorionic gonadotropin, is a hormone made by the pregnancy that can be detected in the mother's blood or urine even before the woman's missed period. This hormone is what we look for with a "pregnancy test".

HCG is first detectable in the blood as early as 7-8 days after ovulation by very sensitive HCG assays (research assays). In real life, blood pregnancy tests will be positive (> 2 mIU/ml) by 10-11 days after HCG injection or LH surge.

In general, the HCG level will double every 2-3 days in early pregnancy.

85% of normal pregnancies will have the HCG level double every 72 hours.

HCG levels peak at about 8-10 weeks of pregnancy and then decline, remaining at lower levels for the rest of the pregnancy.

There is a large variation in a "normal" HCG level for any given time in pregnancy.

Pregnancies destined to miscarry or to be ectopic (tubal) pregnancies tend to show lower levels (eventually), but often have normal levels initially.

Some normal pregnancies will have quite low levels of HCG - and deliver perfect babies. Caution must be used in making too much of HCG "numbers". Ultrasound findings after 5-6 weeks of pregnancy are much more predictive of pregnancy outcome than are HCG levels."

See more details on the link to the website above.