Hi mama! That's a really good question, honestly, the difference between the two can be confusing kasi technically low normal is still within safe range, while oligohydramnios is already below what's considered safe for baby. Pero yung exact numbers and what it means for your pregnancy specifically, kailangan talaga i-discuss yan with your OB kasi they'll look at the whole picture (your weeks, baby's development, etc.) and they'll know best kung ano ang next steps. Hindi sya something to worry about on your own, mama, your doctor will guide you.