Final answer:
The nurse's next action should be to prepare the client for surgical evacuation. Administering pain medication or applying ice may provide temporary relief but will not address the underlying issue, and encouraging the client to ambulate may exacerbate the hematoma.
Step-by-step explanation:
After notifying the primary health care provider (PHCP), the nurse's next action should be to prepare the client for surgical evacuation. A vulvar hematoma is a complication that requires immediate medical attention, and surgical evacuation may be necessary to address the hematoma and prevent further complications. Administering pain medication or applying ice may provide temporary relief but will not address the underlying issue, and encouraging the client to ambulate may exacerbate the hematoma.