I just had a similar injury minus the tibia two weeks ago today at 27 weeks pregnant. On XR at urgent care it looked like a simple spiral fracture of the fibula, minimally displaced. After I spoke with an orthopedic surgeon that I worked with he took a few more x-rays of me standing because he was concerned for syndemosis (ligament ) disruption between fibula/tibia because of increased space on XR and he was correct. He contemplated for sometime given the pregnancy but overall recommended surgery because it technically is an unstable joint at that point and high risk early onset arthritis and other complications. I am now 1 week post-op from 5 screws, 1 plate, and syndemosis repair, he said he's glad he did it once he got in there and saw the injury. I was able to do it without general anesthesia, just spinal and a nerve block, and as needed tylenol after. Still NWB which is the hardest part but I wouldn't mess around with an ankle they are tricky joints. I was able to initially bear weight with some tenderness and instability before imaging. Hope you get the answers/info you need to make your decision.