Confused about anatomy results.

I have to wait until the 10th to hear from my doctor what the ultrasound results actually say. But I'm stressing out because at the end of the results it says that they recommend another growth scan at 32 and 36 weeks and two anenatal visits a week starting at 36 weeks. I haven't gone through any of that with my other kids and I have no idea what they are concerned about right now. Her growth for her head circumference at 19w5d was in the 9th percentile but everything else seemed okay so I just figured she was small like her sister was. Has anyone else had these recommendations and what was it for?? I don't wanna keep bugging my Dr but I'm the biggest worrier.