I had a routine Doctor appt today and my belly was measured. She said I was measuring a little small and she would like to schedule me for an ultrasound. I just had an ultrasound at 32 weeks and everything measured perfectly. My doctor proceeded to tell me that she just wants to check fluid levels and to ensure that the baby's symmetrical measurements are equal. Meaning the head and tummy match. Has anyone experience this? What happens if the measurements do not match?