Baby's head measuring behind

Hi y'all. So I am a Type 1 diabetic and have been doing monthly growth ultrasounds. I went in yesterday and the tech said she is weighing around 3lbs (I am 29+5). Then she said that the head is still measuring small and will send it to the doc. To review, I still haven't heard anything. My baby has always had her head facing down. Has anyone else had a similar situation and should I be worried?