My pregnancy is 24 weeks now, is unconjugated estriol normal?

My pregnancy is 24 weeks now. my Quadruple Marker Test was done with in 20 weeks of pregnancy. This results are Alfa Feto Protein -56.40 ng/ml , Unconjugated estriol-<0.07ng/ml , Hcg - 24122.00 mlu/ ml , Inhibin A - 588.90 pg/ ml. Is Unconjugated estriol-<0.07ng/ml rslt abnormal ? How i recover ? Age: 27 Male Medications: eltroxin 50 , speedral , folvite General Information: All test are ok. Usg anomaly scan is ok.