Worried about HCG levels?

I am exactly 4 weeks pregnant. My period is due today but never came. I got BFP yesterday morning. Today at 4pm the doctor said my blood hcg levels are only a 16?? So they put me down as inconclusive. They couldn't say whether I'm pregnant or not. I took like 6 urine tests and they are all coming back with faint positives. I'm only 14 dpo. I am a crying mess right now. Am I going to miscarry or can it be that the hcg is low because I'm so early? I'm so heartbroken :( I want this baby so bad. This is my first pregnancy.