Water?

I’m 37+4 today and since I’ve woken up I’ve had the feeling of having ingested too much water? Like when your belly feels all sloshy and full of water and you can feel it moving around when you drink too much water? Not quite sure how to explain it but I think everyone’s had that feeling. Thing is I’ve only taken a few sips of water through the morning, definitely not enough to feel this full and sloshy?

I don’t need to pee or anything, I just feel like a big water balloon any idea what’s up?