Low Amniotic Fluid - 37+2

I went to my doctor appointment this morning and my doctor said that my fluid was way lower than he’d like. I guess it’s supposed to be between a 8-18. They measured twice. The first time being 7.5 and the second being 10. He said they averaged it out to about a 9. He’s going to recheck it Friday (we’ll be 37+5). This is our second pregnancy and I didn’t have this with our first. Has anyone ever had this? What do I need to expect if it’s still low? Possibility of going earlier than planned?