Hi, thanks for writing to HCM.
From the description, I feel that you could have sustained a soft tissue hematoma
The dependent oedema of pregnancy
might have added to the inflammatory swelling of the calf and ankle.
The following measures may provide some relief
* Rest to the injured part
* Ice packing to alleviate the pain
* Use elastic compression bandage around the swollen area
* Elevation of the limb to resolve the swelling
& anti inflammatory medications
Hope this information is helpful. Good day