I might be going crazy!

I'm 35 weeks 3 days, I bent over twice today once to put my shoes on and the second time when I was pulling my pants up after I peed and it sounds like a swooshing noise in my belly. There's no way, I don't believe, that it could be the fluid around the baby. Must be because of the amount of water I've drank today? Idk. Has anyone else experienced this? Thanks for your help!