Low Amniotic Fluid

Stacy
I had my 20 week ultrasound on Monday and my doctor said the amniotic fluid was measuring 8.4 which is a little low and should be around 8.6. Has anyone else had this and what was the result? The doctor is having me come back in 2 weeks to recheck it but I made the mistake of looking it up on the internet and now I'm worried.