Brief Answer: Even in patients who had prior cholecystectomy, a acute pancreatitis may reoccur. Detailed Answer: Hello, Thank you for using HCM. Even in patients who had prior cholecystectomy, a biliary etiology (obstruction localized in the bile duct and pancreatic duct, or both) of acute pancreatitis may exist. It can be caused by bile duct stones, micro calculus or sludge remained in biliary ducts after cholecistectomy. Meanwhile, weight gain and hormonal changes predispose pregnant women to biliary sludge and microcalculus formation. Even though main causes of pancreatitis are gallstone migration and alcohol abuse, there have been discovered many other causes too, such as hypertrigliceridemia, hypercalcemia, some drugs, infections, genetic disorders etc. So, you should see a gastroenterologist who may guide you through the right steps to make a right etiologic diagnosis of your Pancreatitis. You may begin with an abdominal ultrasound with no radiation to the fetus as the initial imaging technique of choice to identify a biliary etiology. You should need to undergo a series of laboratory exams too, such as full blood count, calcemia, triglyceridemia, serum bilirubin, alcaline phosphate, albuminemia ect . Hope this is helpful. Let me know if you need more clarifications. Otherwise please close and rate the answer. Kind Regards, Dr. Juarda