not to scare you but decreasing levels of amniotic fluid are not good for the baby.In worse case scenario they wld induce the birth(after 32-34 weeks) to make sure tht the baby comes out fine.Wld probably be hospitalised for 1-2 weeks.Sometimes they wld transfuse you esp if its much earlier in your pregnancy.
I read about it sometimes ago
this is the link
Low amniotic fluid levels : Oligohydramnios : American Pregnancy Association
try to rest in bed more n increase water intake.coz some mummies in another forum who had the same prob did this n it did help some of them.
Sometimes the levels just increase on their own.
Will pray for you n your baby.Hope it works out well.