My sister in law had gallstones, she passed them when she did a wee. Pain full cramps and painful to pass. She had really bad stomach cramps through out her pregnancy. But now shes fine. She has only just gone on maternity leave. Hers were small stones.
Last pregnancy I had kidney stones twice. I couldn't work until I passed them. I had to go to labor & delivery to be watched and given pain meds.
I have gall stones and they are acting up now during 3rd trimester but I think it has a lot to do with my diet. I've been eating a lot or bread and other junky food that generally causes inflammation for me. I know if I go back to eating lots of produce and greens that and the reflux will stop. I also take milk thistle which helps with nausea and the gall pain. Good luck!