You can't. Your doctor will follow the pregnancy closely to be sure the fetus continues to grow normally. How the pregnancy will be managed depends on how far along you are, how your baby's doing and if you have other complications.
You can read more about low amniotic fluid (oligohydramnios) in the link below.
Amniotic fluid surrounds your baby during pregnancy.
The water content of amniotic fluid significantly decrease during the pregnancy, from nearly 99% to 70%.
Amniotic fluid Is a clear, slightly yellowish liquid that surrounds the unborn baby during pregnancy.
An amniotic fluid embolism is a complication of pregnancy characterized by movement of amniotic fluid past the placenta.
You have the amniotic fluid that surrounds the baby. Baby go on drinking this fluid and go on passing the same through the urine.
Amniotic fluid is a nourishing fluid found in the amniotic sac of the embryo. Its main function is nourishment of the embryo. Please refer to the related questions for detailed information on Amniotic fluid.
The Amniotic Fluid.
In most instances too much amniotic fluid is a benign finding during pregnancy, and the baby will be monitored with NST and biophysical profile ultrasound. In some cases too much amniotic fluid can be indicative of downs syndrome, diaphramic hernia, and anephomony.
The amniotic fluid volume is estimated by measuring pockets of amniotic seen in ultrasound. It is then expressed as the amniotic fluid index (AFI). A normal AFI at full-term would be from 5-25 centimeters. To put it into liquid volume measure, there is typically around 800 - 1000 mL during the latter parts of pregnancy.
Amniotic fluid index
Fetal urine is the main source of amniotic fluid in the latter two-thirds of pregnancy
Either by having an ultrasound scan, or by having the amniotic fluid tested.