Head measuring small??

R • Pregnant with my double rainbow baby!
Any moms out there has their baby's head measure small at an ultrasound? This happened to me at 23 weeks. LO   Belly and thigh was right on track, but her head is measuring 2 weeks behind. My doctor is concerned there is something wrong and I go back in 2 weeks. All the structures look perfect he said and she was completely on track at our 20 week anatomy scan and our genetic tests came back lowest risk. If you have experienced this, what was the outcome for you? Prayers are appreciated that my little girl will catch up on head growth. I'm super scared.