Is low amniotic fluid a big concern? they want me to come back twixe a week.

Yes: You should certainly keep your appointments. Complication rates increase as the fluid levels decrease.

Good idea: A low afi should be followed to make sure your baby is doing well. It's one of several antenatal tests that we do to make sure everything is ok. It's usually combined with a nst (non-stress test) and/or a bpp (biophysical profile) done with a fetal monitor and ultrasound. Your doc is doing well.