Bloated, heavy feeling?

I’m 13 w 5 days and having a weird feeling in my lower abdomen. It’s like a bloated/heavy feeling. Kind of like the feeling you get when you drink a ton of water but lower down. I’ve never had it in past pregnancies so I was just wondering if anyone else has/had it and if you know what it is?? It’s only happened a couple times and doesn’t last long. It also stops when I sit.