Hcg levels low at 11 dpo?

Sa

Got a bfp this morning and had blood test completed per RE instructions. Just got the call back and they said "positive but low hcg levels". I asked if it was low considering I'm only 11 dpiui. She said "yeah that doesn't matter." What??!!! Does anybody have any experience with this, I couldn't believe that. I didn't get the actual number, I called back to get it and an waiting for a return call. Going back Monday for another test. Any advice/experience is greatly appreciated!