Quoting Mandy Schlatterer:" I told my doctor I want to go into labor naturally and not be induced like with my son, he said sure, ... [snip!] ... is low amniotic fluid true vs docs convenience and how can I know what to do and if its true so I can do things my planned way?"
I found out the fluid was low for us during a last minute u/s (I was dilated to 4-5 but baby would not drop so did u/s to make sure she was positioned correctly). I ended up being induced. I wanted natural too, but I didn't want to risk going too long with the fluid dropping. I suppose it could be monitored but depends on how comfortable the doc is with that. They can see the fluid level in an u/s and see if it is normal range or not.
I've learned that things don't always go exactly how we want for labor, sometimes you roll with the punches.