I had my gallbladder out before I got pregnant. I'm not sure if that has anything to do with why my experience is so different that what others are describing.
I was actually having gall bladder attacks for weeks and had no idea what they were. My stomach just felt off, usually after I ate. I'm not sure how else to describe it. It wasn't nausea, it wasn't terrible pain, it was just...off. My DH finally made me to go the doctor and they did an ultrasound and couldn't believe I wasn't in more pain. My gall bladder was chock full of stones. They said if I hadn't come in then, I would probably have ended up in the ER having emergency surgery.
So since then I always go to the doc, even when I think it's nothing. Better safe than sorry!