35 weeks and low fluid. Freaking out. Anyone have experience w this?

I am 38 years old and on my 4th kid. 35.5 weeks prego and started the non-stress test and fluid ultrasounds last week. My fluid is at a 9 last week and a 6 this week. They took me off work a week early. My mom-stress test looked good and I'm not leaking any amniotic fluid. I go back Wednesday for another fluid ultrasound but of course I'm freaking out. Anyone have experience with this? Thanks!