Found this site with a guide to what beta HCG levels can be during pregnancy. I tried to copy the table, but it didn't quite work out. LINK HERE (http://www.birth.com.au/class.asp?class=6620&page=8)

in case the link doesn't work, copy/paste this into your browser:
http://www.birth.com.au/class.asp?class=6620&page=8