Watery discharge?

I've been using 1000mg of evening primrose oil for about 4 days, and last night I had a lot more leakage than I was used to! I got worried that it might have been my water, but tried to tell myself it was probably just the oil. I stayed up and kept going to the bathroom to check until I stopped seeing oil in the toilet then went to sleep. When I woke up my underwear were more wet than usual, but not an alarming amount. I changed my underwear so I could check again in a couple hours and it was the same situation - it looked almost as if leakage when you sneeze too hard! After a shower I haven't noticed any leakage at all. Could it be my water was/us leaking, or just my discharge becoming more watery as I'm close to my due date (37+4)?