Low amniotic fluid?

Rachel • 2 handsome boys and 1 beautiful baby girl
I was wondering if anybody else is experiencing low amniotic fluid? I went in for my weekly NST and every week my AFI has gradually been dropping. Today my level was 5.37cm. I will be 38 weeks tomorrow. Just wanted to see if anyone is experiencing this or have been in this situation in prior pregnancies. Any information would be great.