Wet shorts.

So I been super tired yesterday and today and I've seriously been laying down all day with the exception of doing little things for my son. I never really sit down other days until the evening. Anyway so right now I got up and my panties felt damp so I look down and I'm wearing really thin sleep shorts and I can see a wet spot through my shorts but I never felt anything dripping out and I still don't feel anything. Is it my bladder or water? Almost 35 weeks.