Drop in progesterone.

Stephanie • 31 • Married 7 years • Miracle baby 5/20/20 • Dog Mom x3 • 3 Failed IUI's • First IVF 6/15/19 • Miscarried 7/18/19 👼 • FET 9/6/19

Recently had my 5 day embryo transfer on 6/15. I've been on progesterone injections for 3 weeks and I'm on them until I'm 12 weeks.. I had a blood draw (hcg & progesterone) Wednesday and it was 39. I went back for a redraw for both on Fridsy and it dropped to 29.5. I couldn't believe it dropped that much that quick. However my fertility office didn't seem concerned. Should I be concerned?