@carlyrn – I’m sorry you are going through these pain episodes- while being pregnant too.
First- you had major surgery in October and lost part of your intestine -in the process the nerve supply probably was interrupted and has not had time yet to regrow. Therefore, it is easy to understand why you have constipation too. Irregular peristalsis. It’s good that the ER tests were normal though. Unfortunate that the staff didn’t treat you well. Are you able to contact your surgeon or gastroenterologist to talk about what’s happening and what else can do to alleviate the constipation?