Final answer:
The nurse would suspect that the client is experiencing a threatened abortion based on the symptoms mentioned.
Step-by-step explanation:
The nurse would suspect that the client is experiencing a threatened abortion based on the symptoms mentioned. A threatened abortion refers to vaginal bleeding or spotting during pregnancy, which can be accompanied by symptoms such as nausea and vomiting. In this case, the client's brown vaginal discharge, along with her persistent nausea and vomiting, may indicate a threat to the pregnancy. The elevated blood pressure could be a result of the stress and anxiety related to the situation.