beta hcg levels

  My HCG levle on 8/14 was 1101.  I am trying to determine if I had sex on 8/1
  what are the chances this person can be the father of my baby?  I don't think
  he is the father.  I am aware the levels of HCG double every 2-3 days and
  if I do the math the days do not match.  Am I correct?
Dear Kristina:
An hCG level cannot be used to count backwards and thereby determine the date of conception. The level is not detectable in blood until 10-14 days after ovulation, depending on the specific assay. The doubling level has a range of 2-3 days. The level itself is influenced by the number of eggs that have fertilized, even if one ultimately ends up with only one baby.
This information is provided for general education purposes only and is not a medcial consultation. If you have specific questions, please talk with your physician.