Help!

Mi • Tue, Sep 22

Hey all, too is from yesterday and bottom is fmu this morning, I had a blood draw from my fertility clinic yesterday and it only came back at 10miu :( should I be concerned at all? I go in tomorrow for another draw to make sure the numbers have doubled. I still have 3 days until I was supposed to start my period so is it possible that the blood hcg is just that early?