your condition is called oligohydramnios
when the amniotic fluid in the utrerus is said to be less for the period of gestation. it can be calculated using amniotic fluid index
and if it is less than 5 centimeters it is said to be oligohydramnios
it is not constant throught pregnancy
. it is variable and said to be less if the volume is less than expected
amniotic fluid is said to be less due to various conditions like defects of kidney
or urinary tract
in the foetus, if the placenta has anomaly in the vessels providing nutrition,
if the mother is suffering from diseases like hypertention or if the membranes have ruptured leading to the leaking of amniotic fluid,
amniotic fluid is required for the well development of legs and other organs.
also for good movement inside the womb.
it is treatable by 1st diagnosing the cause and treatment of the same.
also it can be corrected by amnio infusion.
i would advise you to have regular antenatal check up with regular ultrasounds,
i hope i have answered your question
wishing you and your baby good health.