Here is some info on beta numbers that I got from another site:
HCG levels in the blood during pregnancy is huge; a single value will not indicate a normal pregnancy! in fact a number of values are necessary before making a number of determinations, including how far along the pregnancy is. Consider the following figures (based on days past ovulation (DPO); all HCG levels and ranges are averages):
? DPO, 14. HCG level, 48 mIU/ml. Range: 17-119 mIU/ml.
? DPO, 15. HCG level, 59 mIU/ml. Range: 17-147 mIU/ml.
? DPO, 16. HCG level, 95 mIU/ml. Range: 33-223 mIU/ml.
? DPO, 17. HCG level, 132 mIU/ml. Range: 17-429 mIU/ml.
? DPO, 18. HCG level, 292 mIU/ml. Range: 70-758 mIU/ml.
? DPO, 19. HCG level, 303 mIU/ml. Range: 111-514 mIU/ml.
? DPO, 20. HCG level, 522 mIU/ml. Range: 135-1690 mIU/ml.
? DPO, 21. HCG level, 1061 mIU/ml. Range: 324-4130 mIU/ml.
? DPO, 22. HCG level, 1287 mIU/ml. Range: 185-3279 mIU/ml.
? DPO, 23. HCG level, 2034 mIU/ml. Range: 506-4660 mIU/ml.
? DPO, 24. HCG level, 2637 mIU/ml. Range: 540-10,000 mIU/ml.
Look most closely at progression: during the huge majority of early pregnancies (80-90%), the level will double every couple of days, or 72 hours. As your pregnancy progresses, levels rise and that doubling time increases. The expected doubling time for HCG levels:
? Under 1200 mIU/ml: 48-72 hours.
? Between 1200 to 6000 mIU/ml: 72-96 hours.
? Over 6000 mIU/ml: more than 96 hours
HCG levels rise during the first 8 to 10 weeks of pregnancy then decline slowly for the second and third trimesters. The following presents some average expected HCG levels based on time after conception:
? week: 0-50 mIU/ml
? 1-2 weeks: 40-300 mIU/ml
? 3-4 weeks: 500-6,000 mIU/ml
? 1-2 months: 5,000-200,000 mIU/ml
? 2-3 months: 10,000-100,000 mIU/ml
? 2nd trimester: 3,000-50,000 mIU/ml
? 3rd trimester: 1,000-50,000 mIU/ml
? Non-pregnant females: < 5.0 mIU/ml