It's hard to tell! Yesterday I would have SWORN I was leaking because I was having lots and lots of watery CM. Called my doctor and they even asked me to go into the hospital to get checked after what I described (soaked 1/2 a panty liner in an hour and 15 minutes). It ended up not being my water, but the nurse at the hospital said it sounded like it was and was glad I came in and had it tested because it's better safe than sorry. They see slow leaks all the time, so it definitely could be. The only way you'll know is if you get it tested.