baby's head and abdomen measuring small

Courtney
My dr told me at my 28 week appt that our baby's head and abdomen were less than 10 percentile. She said it could be that we are having a small baby (my husband and I are petite and have a smaller bone structure) or there might be something wrong. She referred us to an high risk doctor to get more info. She also brought up the option of doing genetic testing. Of course I'm stressing out about this whole thing. Everything else is normal and the baby is consistently active. Any support or reassurance would be appreciated!