Low HCG levels

Posted By Julia on January 27, 1999 at 15:13:13:







  
My first HCG level is 393.  I am 5 weeks, 2 days from my LMP but only 2 weeks 5days from date of conception (according to ovulation predictor test and temperature rise).  My doctor wants to take another level in two days to see how the #s are multiplying.  What does it mean when your numbers start out low?  Should I be concerned?  I had some very slight spotting and cramping when my period was due but nothing since then (about 10 days).  What would cause the number to be so low?  Thank you.