HCG at 14 dpo

Hi There,

My HCG level at 12 dpo was 30mIU/ml and at 14 dpo it was 79mIU/ml. Since it’s below 100 my doctor is a little concerned and he asked me to get another test tomorrow. What you guys think? Is this looking good so far? Anyone had low HCG in the beginning and had successful pregnancy ?