L.A.
My daughter had this start to happen about 29 weeks - long story short - low fluids - bedrest - lots of water I drank - hospital for 2 1/2 weeks then born at 35 weeks. Healthy all is well
Since you are at 36 weeks I wouldn't worry too much about - low fluids are quite common during the end of pregnancy. 36 weeks is starting to get pretty good for delivery.
All is kind of scary - but drink lots of water - I think that helped a lot for my daughter. I drank lots of water and didn't have to pee so much so she was defiantly using it up.