Where did my stomach go?

Yes, I know this is going to sound weird, but I'm just wondering...
Google hasn't been very helpful with this one, but I'm wondering where your
stomach normally goes during pregnancy? Up? Down? Behind or to one side?
I can't seem to find any pictures or info on this, but I've been having some
weird gurgling and stomach stuff happening today.
It started off with very, very loose bowels. Sorry if it's TMI It was
so bad earlier that I could barely control myself. I did not have an upset
stomach, wasn't feeling bad, just BANG! Out of nowhere, I was not able to
fully control myself and running to sit on the toilet with a very loose
stomach. No other issues with that, though, and hasn't seemed to be a
problem since mid-afternoon.
Now, though, I have this rumbling/bubbling feeling. It's right in the
middle, and right kind of under the bottom of my ribs. Like solarplex area,
just directly behind it. It feels almost like bubbles and it's fairly
constant. I don't feel any different (sick or anything) but this bubble
feeling is still there constantly and has been around for probably an hour,
maybe hour and a half this evening.
Is that just my stomach? Where, exactly, does a stomach shift to during
pregnancy? I will have 3 weeks left to go on Saturday, if that matters.