Fluid Leaking?!

For the past week, I have noticed quite a bit of (what I assumed) was watery discharge. I drink a lot of water during the day so I make pretty frequent trips to the bathroom and every single time I go, theres a wet spot about the size of a half dollar, sometimes more, in my underwear. Its definitely not urine because it has no real smell and like I said, I empty my bladder often. I put on a pad just now to see if I can see color or anything. I hate going to L&D; and don't want to feel silly if its just regular discharge but how in the world can you distinguish normal watery discharge from fluid?! Im 34 weeks (almost 35) and I have also had tons of pressure, lightning crotch and cramping/back pain but I feel like thats all normal at this point.