Pregnant but not?

LA
Good and bad news and I'm feeling numb from the emotional roller coaster of this past 12 months. 
After 2 losses, one of which was at 7 weeks and the other at 5, today after two rounds of Clomid, Ovidrel and Progesterone we got news that we are once again pregnant but that my beta hcg is way low at an 8.
 She said they would have wanted to see it around 30. I was due for my period today but have had light brown spotting for the past two days.  Any other PCOS (or other) girls had this experience? I have little hope but this pregnancy with such a low number and with the experience of already having 2 losses weighing heavy on my heart but want to be faithful at the same time. 
I go back Tuesday for more bloodwork.