Low HcG after IUI

I had my second IUI two weeks ago yesterday. I had blood work yesterday to determine if the IUI worked. My results came back with an HcG level of 11 which is considered positive, which means I'm pregnant but the HcG level is very, very low. I was told that after an IUI the doctor likes to see HcG levels at 100 or higher! I'm at 11!!!!!!!!!!!!!! My doctor wants me to come back on Monday for another blood test to see if my levels have increased. I'm so anxious now! What if my levels are still low? I'm doing mad!!!!