Femur Length 2 Weeks Behind

During our OB checkup yesterday, doc said my tummy is a little small for 29w6d. She immediately ordered a fetal biometry scan. Measurements are:

Biparietal Diameter: 31w

Head Circumference: 30w

Abdominal Circumference: 29w3d

Femur Length: 52.4mm, 27w6d (2 weeks behind my AOG).

I haven't gotten a call from my OB so she could explain the results. Next doc appointment is this coming Sat.

Should I be worried? Any of you ladies have similar experiences? What to expect?