When i was 36 weeks pregnant with my son i went for a scan (cant remember why???) and he had no fluid left around him!!! they said that i either leaked it or he drank it all and never passed it!!!!

i was induced a few weeks later after being monitored and it felt weird when they broke my waters as there was only a mini trickle!! but my bubs was born healthy

not sure if the leaking started early but im presumming it did as there was none left at all (details are a bit hazey sorry as it was 3ish years ago! lol). Theres a medical term for it but il have to look it up in Bays book as i cant remember!.
Not sure if that makes any difference to your story lol but thought i would share it anyway! lol
I would definately go see your MW though and get it checked out as its better to be safe than sorry