Is the HCG test the same as a beta test?
I did an IUI back in mid May and when I tested 15 later my beta was 44 which was too low for that time. It should've been over 100. When I did my second test it had fallen which means it wasn't a viable pregnancy.
What did your doc tell you about the 6.5? I hope that it's something completely different than the beta. When do you test again. I think 11 days is a little early. It usually takes a fertilized egg anywhere from 6 to 12 days to implant, so hopefully you just tested too early.
Keep me posted and good luck to you!!!