Hi, This Is My First Ivf Pgd Cycle. We Have

Hi, this is my first ivf pgd cycle. We have 6 day blastocyst grade b . Pgd results came back normal boy.Did the FET on May 25th. Hcg was 81 on June 5th. Today was my second blood work for hcg and it dropped to 37.
During my normal pregnancies I used to be always late. I mean I would be 2 months my LMP but the embryo would be around 5 weeks and few days. I am very worried not understating what to expect. Do you think I still have hope. Thanks