Experience with low amniotic fluid in 2nd tri?

Ri

I went for my 20 wk ultra sound and had to go back for better images due to low amniotic fluid. My Dr didn’t explain what this meant. After my follow up appointment I asked what it means for the baby. I thought I was keeping hydrated? I was also told it does not have to do with my fluid intake? I feel like I’m getting mixed info. Anyone else dealing with low amniotic fluid in 2nd trimester?